Potez 25A-2 serial 330 (1938 system) (EMFA/CAVFA via L.Tavares)
Potez 25A-2 serial 330 from the 1938 serialling system. (EMFA/CAVFA via L.Tavares)


Aircraft serialling systems

This section is dedicated to one of the most intricate aspects of the Portuguese Military Aviation history : the serialling or identification systems applied to military aircraft. Only recently, and with the help of some official documents, we were able to clarify the different systems used  in the identification of our military aircraft. Presented below are the conclusions to which we arrived (published already in MAIS ALTO - Air Force magazine), explaining the systems used, in a chronological order.
 For those who have read the articles in MAIS ALTO we remark that some more information is given here.
 

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 Arma de Aeronáutica (Army Aviation)

Aviação Naval (Naval Aviation)

Força Aérea Portuguesa (Portuguese Air Force)


Arma de Aeronáutica (Army Aviation)

1 - Nominal system

Even before the military aviation was organized as an entity, some aircraft were offered to the Portuguese Government as result of gifts. These aircraft, very few in number, and usually only one example of each type, never received serials but were known by their own names.
 

2 - Sequential system by aircraft type

This system started with the "Escola de Aeronáutica Militar" (E.A.M.) activation, and consisted in the assignment of a serial number to each and one aircraft of a certain type, in sequence. For instance the Caudron G.3 received serials from 1, 2,3  and Potez 25 Serial 8 in sequential system (EMFA/CAVFA)so on, as well as the Farman MF-11 (designated as MF11-1, MF11-2) and others.
Some aircraft, usually due to their condition of single examples did not receive serials - this was the case for instance of the Morane Saulnier Type H and Breguet 14T-bis.
 
 

3 - Block numbering system

In 1935, serials began to be assigned in blocks of numbers with three digits each. The blocks were non-contiguous  and were relate dwith the airfield where the aircraft were based or stationed.
This system was officialized through the Circular (Regulation) 172 of March 16, 1935 of the 3rd Division of the "Direcção da Arma de Aeronáutica" (Directorate of the Army Aviation).
The following table show some examples of the changing that took place, when going from one system to another:
 
Aircraft
Location
Serials in former system
Serials in new system
Tiger Moth Sintra 1-2-3-4... 100-101-102-103...
Tiger Moth Tancos 10-11-12-13... 135-136-137-138...
Morane Sintra 2-3-4-5... 150-151-152-153...
Morane Tancos 6-7-8-9... 180-181-182-183...
 However this system was not well understood by some locations, which thought that a certain group of serials had been assigned to the airfield and not to the aircraft.

Morane serial 180 and Tiger Moth serial 138 in block system (EMFA/CAVFA)For instance, in November 12, 1935 when the Moranes 151, 152, 192 and 194 were transferred to Tancos, they were given at that location the serials respectively 185,186 183 and 184 (and they were painted on the aircraft).
On the same date the Moranes 183 and 184, which had been based at Tancos were attributed to Sintra where they maintained these serials.
So, during some time (1936-37), two serials were being used by four aircraft simultaneously:  Moranes 183 and 184 were flying at Sintra, at the same time that other two Moranes, but also serialled 183 and 184, were flying from Tancos!

Also there were cases of different aircraft having the same block of serials assigned : that was the case of Tiger Moth and Ju-52- both using the 100 to 110 block, and the range 125 to 137 being used at the same time by the Avro 626 and Tiger Moth.

On the other hand this system was not applied immediately everywhere, as in October of 1935, there were still instances of aircraft flying with the old sequence system.
 

4 - Block numbering system - 2nd version
 
After the restructuring of 1937 (see  Portuguese Military Aviation in Brief), and to put some order in a system full of irregularities as mentioned above, a new numbering system was created with the Circular (Regulation) 642 of June 3, 1938.
 This Regulation adopted  the same block system as the previous one, but this time more clearly defined, as such  to the eight types of aircraft then in service, were given blocks of 50 serials from 101 to 450. The block 501 to 549 was assigned to special aircraft, either because were bought as test specimens or were single examples of a certain type.

Follows a transcription of the most important paragraphs of the mentioned Circular :

a) The basic serials to be adopted are the following:
 

Aircraft type
Serial
Tiger Moth 101 - 150
Avro and Morane 151 - 199
Junkers Ju-52 201 - 250
Junkers Ju-86 251 - 299
Potez 301 - 340
Vickers 351 - 380
Fury and Hind 401 - 420
Gladiator 451 - 499
Various (Dragon, Caproni, etc.) 501 - 549
b) The Avro 626 serialled 125-126-127-128-129-130-131-135-136-137 are re-serialled 160 to 169. Miles Martinet serial 437 in 2nd block system (EMFA/CAVFA)

c) The Vickers 200-201-202-203-204-205-206-207-209-210-211-212-213-214-
225-226-227-228-235 and 236 are given the serials 351 to 370.

d) The Ju-52 serialled 101 to 110 are given the serials 201 to 210.

e) The Hind 275-276-277 and 278 are given the serials 404 to 407.

f) The Tiger Moth 100 is re-serialled 120.
    The Avro 150 changes to 170.
    The Junkers Ju-86 serialled 250 changes to 260.
    The Fury 400 changes to 403

DH-84 Dragon 504 in 2nd block system (EMFA/CAVFA)g) All the aircraft Tiger Moth, Morane, Potez, Ju-86, Fury, with the exceptions mentioned in f) as well as the Avros not mentioned on b), and various others (Dragon and Caproni) maintain the actual serials.

Also it was clearly stated that the changes should be "in effect as soon as possible",  and the aircraft should maintain their serials when affected to other bases.

During the W.W.II period, a large number of aircraft was incorporated in the "Arma de Aeronáutica" at the same time, forcing the use of serials that had been assigned to aircraft retired meanwhile.

So, the blocks starting in 510 and 600 were given to the Hawker Hurricanes. The 300 series occupied before by the Potez 25, already out of service, was used by the new Spitfire I, Airacobras and P-38 Lightning.

However, and as an oddity,  the Spitfire V received still during the war and afterwards, was given the block 1 to 95.

The 700 block was used by the T-6 / Harvards received from 1947 and after. The Airspeed Oxford occupied the 500 block which was used also by the DH-84 Dragon (504 to 506).
 

5 - Alpha-numeric system

A special system was used during W.W.II, which consisted on the assignment of alpha-numeric serials to some aircraft interned or force landed in Portugal and used by the "Arma de Aeronáutica" - this was the case of the 6 Consolidated Liberators of different models, which were given the serials L-1 to L-6, the Lockheed Hudson (H-1 to H-3) and Douglas C-47 (D-1).
 

 6 - Independent numbering system

This system was used in Moçambique, by the aircraft which belonged to the "Quartel General de Lourenço Marques" (Army Headquarters at Lourenço Marques),  around 1940.
They were given serials with one or two digits and the following cases are known : Tiger Moth 1 to 9, Hornet Moth 10, General Aircraft Monospar 15, Avro Anson 20 and 21, and Beech Bonanza 25.
Late in 1946 these aircraft were assigned to the "Unidade de Instrução Aeronáutica" (Aeronautical Training Unit).

With  the implementation of Portaria (Regulation) 13602 of July 11, 1951 (see below) , the aircraft also received numbers in the new system, and in May 1952 some of them were incorporated in the "Força Aérea Portuguesa" : Tiger Moths with serials 1180 to 1188, Hornet Moth with serial 9201 and Beech Bonanza 9301.

7 - Four digits system

This system was introduced with Portaria (Regulation) 13602, of July 11, 1951.

This  was a completely different system , and took some time to be completely adopted. As such it was only fully implemented Ju-52 still camouflaged but already with serial 6302 of 1951 system (EMFA/CAVFA)by the new Air Force organization.

Anyway, the Nota (Note) 969 of June 8, 1951, of the 2ª Repartição (2nd Department) stated that the new system was to be applied only to the following aircraft in the inventory : Chipmunk, Harvard / T-6, Junker Ju-52, C-47,  B-17, C-54.
Even so, and later, other aircraft already in service in 1951 received serials from the new system . It was the case of the Magister (12**), Oxford (21**), Anson (22**), and Dragon (23**).

As another interesting fact a three view drawing of an Hurricane with the serial 4202 was in the archives of Portuguese Air Force, representing perhaps the idea of applying also the system to the famous British fighter. However as far as we know this intention was never materialized.
 

Aviação Naval (Naval Aviation)
In what concerns Naval Aviation,  four systems were used during its existence to assign serial numbers to aircraft:

1 - General sequential system

First system used, its application began in 1917 with the F.B.A hydros, and continued with the Donnet-Denhaut D.D.8 received from the French Aeronavale, when leaving Aveiro, at the end of W.W.I. It consisted in the assignment of the natural sequence of numbers (1,2,3...) to each and one aircraft type. So, the F.B.A had serials 1,2,3 ,.. like the D.D.8.However, in the case of the D.D.8, not all the numbers were assigned, as explained below.
 
 2 - Unique sequential system

This new system consisted in the assignment of serials beginning at 1, but only in one series, and to all aircraft in service. This would effectively prevent two different aircraft of having the same serial, as happened in the first system.

In some cases, and to allow an easier identification, a second number was given to each aircraft to represent its position within Junkers K-43W serial 60 fleet number 5 (EMFA/CAVFA via L.Tavares)the fleet. However, and in order to differentiate it from the proper serial (usually painted in the rear fuselage) it was painted in the front fuselage and in a bigger size. The photos show some examples.

The serial sequence went from 1 to 136, but more than 136 different aircraft were received. This was due to the fact that not only some aircraft used serials left by others out of service (case of the D.D.8 that "gave" serials to the Tellier T.3), but also because some types did not even used serials in the sequence (case of the Felixstowe F.3 and the Georges Levy).

There were also at least another two odd cases :

a) The General Aircraft Monospar as far as is known never received an identification (perhaps because of being the unique aircraft of that type)

b) Four DH-60G Gipsy Moths were delivered with floats from De Havilland, and serialled 52 to 55. Due to crashes and other reasons, the fleet disappeared in a short time. Subsequently another four aircraft were "re-manufactured" from spare parts and parts of the retired or crashed aircraft, and received the same serials ! They can be distinguished however from the former ones, as they were "delivered" with wheels.
 Tiger Moth T-3 still camouflaged (EMFA/CAVFA via L.Tavares)

3 - Alpha numeric system
 

From 1943 the Naval Aviation received some aircraft from the United Kingdom due to the reasons explained already in the brief history of our military aviation.
As it happened, after the last example of the sequential system (the 136 serial given to a Short Sunderland I, ex RAF P9623 landed in emergency in Portugal in February 1941, but only later put on service), a new system was implemented.

To each type of aircraft was then assigned a serial consisting of two parts: the first part was a letter designating either the manufacturer or the mission, and the second part was a number separated from the letter by an hyphen, and designating the aircraft order within a fleet.

Some examples:

Beechcraft AT-11 and D-18S - BC-1 to BC-12 Beech D-18S BC-9 after a nose landing... (EMFA/CAVFA via L.Tavares)

North American SNJ-4 - I-1 to I-8

Curtiss SB2C-5 Helldiver - AS-1 to AS-24

Bristol Beaufighter - BF-1 to BF-17

Also to some aircraft that had the serials applied in the previous system, a leetr was added before the serial, like in the G-21B 97 that began to display the serial G-97.

This system was used until 1952, when the Naval Aviation ceased to exist due to integration of its aircraft in the new born Air Force.
 

4 - Integrated system
 

When the newly formed "Esquadrilha de Helicópteros da Marinha" began to operate in 1993, their new Westland Lynx Mk.95 were given the serials 9201 to 9205, in accordance with the rules then in use in the Air Force. However, when the new Air Force system was introduced in 1993 they also received the digit 1 before the assigned serials (becoming 19201 to 19205), and the serial colour changed from black to white. So, when the frigate "Vasco da Gama" left Lisbon in February 3, 1995 for the Adriatic to join the STANAVFORLANT forces, the Lynx aboard was already painted in accordance with the new rule.
 
 Below we present a list as complete as possible of the serials assigned to the Naval Aviation aircraft :
 
 
 

Aircraft type
Serials
Remarks
F.B.A.Type B 1,2  It seems 8 aircraft were bought. The first two delivered in 1917 received serials 1 and 2. The other 6 were damaged beyond repair during delivery voyage on ship.Later, a third aircraft was built with fuselage of the first and wings of the second, maintaining the serial of the fuselage ! Is the one  on display nowadays at the Navy museum in Lisbon.
Donnet Denhaut D.D.8 1 to 18 The aircraft 1,5,12,13,15,16,17 and 18 did not fly
Tellier T.3 1 ,5,12,13,15 Took serials left by the D.D.8's
Georges Levy 40HB-2 -- Not used ? No serials assigned.
Felixstowe F.3 -- Used the c/n's as serials : F.4017 and F.4018
Fairey IIID/IIID Mk.2 16 to 20 The Fairey IID Mk.2 did not receive serial
Curtiss HS-2L 21 to 24 --
Fokker T.IIIW 25 to 28 --
Avro 504K 29 to 31 --
Hanriot HD.41H 32 to 37 --
C.A.M.S.37A 38 to 45 --
Macchi M.18 46 to 51 --
DH-60G Gipsy Moth 52 to 55 Later other four aircraft took the same serials. See text
Junkers K.43W 56 to 60 --
Fleet 10 61 to 65 --
Fleet 10G 66 to 70 --
Hawker Osprey III 71 and 72 Only the  two assigned to ships received serials.
Blackburn Shark IIA 73 to 78 --
Fleet 10G 79 to 81 --
Fleet 10 82 to 84 --
Avro 626 85 to 96 --
Grumman G-21B 97 to 108 --
Fleet 10B 109 to 118 --
Grumman Widgeon 119 to 130 --
Fleet 16 131 to 135 --
Short Sunderland I 136 --
Miles Martinet T.T.1 M1 to M4 --
Airspeed Oxford I O-1 to O-12 --
Bristol Blenheim IVF B-1 to B-12 --
DH-82A Tiger Moth T-1 to T-20 --
Bristol Beaufighter TF.X BF-1 to BF-17 16 delivered initially. One crashed and replaced
Beech AT-11 Kansan BC-1 to BC-7 --
Beech D-18S BC-8 to BC-12 --
Curtiss SB2C-4 Helldiver -- --
Curtiss SB2C-5 Helldiver AS-1 to AS-24 --
Westland Lynx 19201 to 19205 --
 
 SNJ-4 I-4 (EMFA/CAVFA via L.Tavares)

Força Aérea Portuguesa (Portuguese Air Force)

1 - Four digits system (inherited from Arma de Aeronáutica)

The four digit system developed  by the Army and explained above, was continued by the Air Force. PV-2 Harpoon VIP version serial 4604 (EMFA/CAVFA)
Seven basic functions for the aircraft in service were defined. These functions corresponded to the first digit in a serial composed of four digits. The second digit corresponded to a specific model of aircraft, and the two remaining digits were assigned in sequence to the aircraft model in question.

The application of this system to the Air Force aircraft was done as follows:
 
 
 

Serial Aircraft model
Remarks
11** Tiger Moth Full serial only applied to aircraft integrated later in the Air Force coming from the Naval Aviation
12** Miles Magister --
13** DHC-1 Chipmunk --
14** Not used --
15** -- Used in the 1970's coming for South Africa , but thought for the Miles Martinet (never used ?)
16** T-6/Harvard --
17** -- Used by the Air Force for T-6 / Harvard's
18** -- --
19** -- Used later by the T-33 / Silver Stars
-- -- --
21** Oxford --
22** Anson --
23** Dragon Rapide --
24** Grumman Widgeon, later T-37 --
25** Beech AT-11, D-18S --
-- -- --
31** Westland Lysander Never applied ??. later used by Cessna 182C 3166
32** Piper Super Cub --
33** -- Used later by Broussard and DO-27
34** -- Used later by DO-27. Used by Cessna 401B as 3406 (this aircraft did not belong to FAP).
35** -- Used later by Auster D.5
36** -- Used later by Piper Cherokee (3601-3604), Cessna 185A (3620-3624), Cessna 206 (3640), Cessna 310B 3651.
37** -- Later applied to Reims-Cessna FTB 337
-- -- --
41** -- Thought for Gladiators ?
42** -- Thought  for Hawker Hurricane, but as far as is known not used.
43** -- --
44** -- First aircraft to receive serials in the Air Force - F-47 Thunderbolt
45** -- Thought  for the Helldiver, but as far as is known not used.
46** -- Later applied for PV-2
47** -- Later applied to Neptune P2V-5
-- -- --
51** -- Later applied to F-84G
52** -- Later applied to F-84G
53** -- Later applied to F-86F
54** -- Later applied to Fiat G.91
55** -- Later applied to A-7P
56** -- --
57** -- --
58** -- 5801 and 5802 applied later to two DH Vampires, and 5803 to a Jet Provost demonstrated in Lisbon
-- -- --
615* C-47 / Dakota --
62** -- --
63** Ju-52 --
64** -- Later applied to Nord Noratlas
65** -- Later applied to Casa Aviocar
66** C-54 --
67** -- Later applied to DC-6
-- -- --
71** SA-16 Albatross Later applied to B-26
72** -- --
73** -- --
74** SB-17G --
75** SC-54 / HC-54 --
-- -- --
88** -- Later Boeing 707-3F5C
-- -- --
91** -- Later H-19
92** Hornet Moth Later Alouette II and III
93** Beech Bonanza Later Alouette III
94** -- Assigned to G-21B but probably not used. Later used by Alouette III
95** -- Later SA-330 Puma
 
 Jet Provost demonstrated to FAP with serial 5803 (EMFA/CAVFA)

The following list although not  originated  from any official document, was put together based on the analysis of the documents available, and represents the concept for the serials assignment :
 
 

First digit
Function
1
Single engine training
2
Multi-engine training
3
Reconnaissance / Observation
4
Fighter or anti-submarine (Piston engine)
5
Fighter (Jet engine)
6
Transport
7
Search and rescue or bomber (Piston engine)
8
Reserved
Miscellaneous
 

The complete revision of the serials applied to the aircarft in service was only completed by 1958. Even so, some aircraft G-21B already in the Air Force but with serial G-103 (EMFA/CAVFA)coming from the Naval Aviation, never received correct serials within this system. It was the case of the Helldivers, which adopted the serials in the format AS-**, applied above the Portuguese flag on the rudder.The same happened to  the Grumann G-21B which used the former Naval Aviation serial (see photo)  also above the flag on the rudder.
 

 2 - Direcção de Serviço de Material (Material Department) instruction - August 5, 1969.

These rules introduced some slight changes in the system mentioned above, basically  the meaning of the first digit : the "type" represented from then on a mix between the function/mission and type/class of aircraft. This was intended to solve a shortage of available serials and the simultaneous introduction of new types of aircraft.

The following "types" were then created:
 
 

First digit
"Type" of aircraft
1
Single engine training
2
Multi engine training
3
Reconnaissance / Observation
4
Fighter (Piston engine)
5
Fighter (Jet engine)
6
Transport (Piston engine)
7
Search and Rescue or Bomber (Piston engine)
8
Multi engined jet (except fighter)
9
Miscellaneous
The B-26 Invaders were the first type to receive serials , according to the table above (7101 to 7107).
 Reims-Cessna FTB 337 3710 Montijo 1986 (L.Tavares)

3 - Portaria (Regulation) 101/80 of March 12, 1980

This document approved and put in force the "Regulamento das Pinturas Insignias e Marcas das Aeronaves da Força Aérea RFA 401-2" (Rules for the Painting and Markings of the Aircraft of the Portuguese Air Force).
It replaced the  former one of July 1951, but did not change the concept for serialling the aircraft. It only defined exactly the location, colours and dimensions of the serials as applied on the aircarft.
 

4 - E.M.F.A. (Air Force Headquarters) / 3rd Division study - December 22, 1988
 
This aim of this study was to update the serialling system concept, and to correct some deviations that had happened since the implementation of the 1951/1969 system.

The most important deviations had been :

A-7P - Given serials in the range 5501 to 5550, being not fighters.
P-3P - Received the serial 4801 to 4806, which corresponded to fighters with piston engines.
ASK-21 - Received the serials 1001 to 1004 being a sailplane/glider.

This new system would be a compromise between the existing system and the needs arising from the automatic treatment of information. The criteria defined then would force the change of all serial in the wole F.A.P. fleet.
However it was not approved, and  the changes to the existing fleet were not implemented.
The basis of the system would be the table shown below :
 
 

First digit
Type/class of aircraft
1
Sailplanes (gliders) with or without engine
2
Conventional aircraft single engine
3
Conventional aircarft multi-engine
Turboprop aircraft single engine
5
Turboprop aircraft multi engine
6
Jet aircraft single engine
7
Jet aircraft multi engine
8
Helicopters single engine
9
Helicopters multi engine
Neverthless some serials were applied to  aircraft bought in the meantime. It was the case of the Falcon 50 (74**), Westland Lynx (92**), and the F-16 Fighting Falcon (66**).
 
 

5 -  CEMFA (Chief of Staff of the Air Force) Directive - September 7, 1993

The so called "Sistema de Atribuição de Números de Matrícula" (  Serial Assignment System), was established in January 1, 1994, adding a fifth digit to the serial (five digit number). The following concept is in use:

1st digit - Series - It was considered that  fleets not in service  at the implementation date would remain in the series 0, maintaining in consequence the 4 digits as before.
The fleets in service would receive the digit 1 in this position. This also means that the first digit 0, used only for data systems handling, should never be displayed in the aircraft. Unfortunately some aircraft in statical dispaly received incorrectly the digit 0 !

2nd digit - Type - It is ssociated to the basic function / mission of the aircraft as detailed below:
 
 

2nd digit
Function/Mission
0
No engine airplanes without engine
1
Training single engine and sailplanes / gliders with engine.
2
Training multi-engine
3
Liaison / Reconnaissance
4
Maritime patrol and bombers
5
Fighters and fighter-bombers
6
Transport
7
Support and specials
8
Reserved
9
Helicopters and miscellaneous
3rd digit - Constructor / model - Fleets of the same aircraft model

4th and 5th digits - Sequential number for the same aircraft model.

The implementation of this system forced the following re-seriallings:

ASK 21 from 1001-1004 to 10101-10104
Falcon 20 from 8101-8103 to 17101-17103
F-16A from 6601-6617 to 15101-15117 (this change was done before delivery)
F-16B from 6618-6620 to 15118-15120.

The system was used also for the first time in new FAP aircraft (besides the F-16)  the Alpha Jet and the CASA Aviocar 212-300. These examples are detailed below :

Alpha Jet 15245 at Beja (L.Tavares)
Alpha Jet: Numbered 15201 to 15250

1 - Series, digit 1.
5 - Type: fighter-bomber.
2 - Second fleet of the same type (the first is the F-16)
01- First of the fleet up to 50.
 

CASA  212-300: Numbered 17201 to 17202

1 - series, digit 1
7 - Type, support and special. Aircraft equipped for aerial reconnaissance, within the SIFICAP programme - Sistema de Fiscalização e Controle das Pescas- (Fisheries Surveillance).
2 - Second fleet of that type (the first one is the Falcon 20, serialled 171**, for the  ground navigation systems callibration)
01- First of the fleet
 

Bibliography-

1 - Records on  author's collections of air activity of military aircraft, collected from pilots Log-books and Air Activity books of Air Bases  (1977-1988)

2 - Portuguese Air Force Historical Archive - "Ordens de Serviço" and several documents kindly provided by Cel.José Carlos Montalvão Guimarães

3 - "Ordens de Serviço", Flight Records and many documents read in Air Bases 1, 3 and 6 (Sintra,Tancos and Montijo), (1978-1986)

9 - MAIS ALTO nº41, Year 5, May 1964.

10 - Peixoto,Lemos  - "Homens e Aviões na História da Amadora" - Edition of Amadora Municipality 1980.

11- Lopes, Mário Canongia - "Os Aviões da Cruz de Cristo" - Dinalivro, Lisboa 1989

12 - Ferreira, Joaquim Guilherme Diniz "Aeronáutica Portuguesa" - Author's Edition, Lisboa 1961

13 - Cardoso, Edgar - "História da Força Aérea Portuguesa" - Gratelo SARL, Amadora 1981

14 - Many documents from the author's collections, and letters from friends, including Mr. T.R.Judge with invaluable help on the difficult subject of the Fleet aircraft.

 

 
 
 
 
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