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Thread: Who can explain me the codes in some AIR.25 files

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    Default Who can explain me the codes in some AIR.25 files

    Last year I visited the National Archives and made a lot of copies of Nos 3 Group mission files.
    From these files I trie to figure out the routes that were flown during a mission. I managed to find a lof of info on the internet but some things remain mysterious to me.
    Who can help me out with some abbreviations and codes

    On a paper which is named B405 and contains info about a flight on 23/12/1944 I find
    1) for Target "SUNFISH A.P. A": I know SUNFISH is the code for TRIER but what means A.P. "A"? Aiming Point A?
    2) Then I see K & L routes? This is the route to and from the target but what does K & L stands for.

    On an other form B410; Night 24/25 december 1944 I find:
    1) Target GSGS 4416 Sheet S.1 855882: I found the map on the internet but the airfield Hangelar is located on the bottom of the sheet above(R1). Does this mean the definition of target was the place to release the bombs?
    In this same form I see under 6 Special intstructions ; "Radar and W/T silence to 0430E." What does W/T stands for?
    I also see some abbreviations which I don't completly understand
    the Abbrev R.A.S. in the tactics area what does R.A.S. Stands for?
    Type Z equipment is to be used, but what is this for equipment.
    Window to be discharged at rate "G" only if engaged by predicted flak

    On Form B8 an attack on Hanau (Elver) 6/1/1945 there are besides ELVER some other Targets named
    GH 5531
    GH 612A
    I assume the men that coded run out of fish but I can't find the GH codes...

    On Mission B28 on 29/01/1945 they flew to Krefeld to bomb the marshalling yards near UERDINGEN the text for target states
    G.H.611 AP 094H 029V on illustration 43/6 Intention to destroy rolling stock and block traffic.
    I Assume GH 611 is Krefeld but where do I find 094H 029V?

    If someone can help me out I can continue my research.
    thanks in advance

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    The only one I can help with is “W/T”. This is Wireless Telegraphy. The sending/receiving messages using the Morse Code and High Frequency (H/F) radio frequencies. This was normally Air-to-Ground and/or Ground-to-Air. The Ground Station(s) was(were) in the UK. All the aircraft using the same frequencies could ‘hear’ the transmissions of the Ground Station(s), but it was not normally used for Air-to-Air communications (too slow!!). Radio silence to 0430E (basically the Dutch coast!) was because any a/c transmitting on W/T could be picked up by the German Direction Finding (D/F) stations long before the a/c came within German radar range. By this time in WW2 there were ‘Wind Finding’ a/c at the front of the bomber stream. They would use H/F W/T to radio those found winds back to Base. At Base those winds (with others, and later information) would be used to update the Route Forecast Winds, and those updates sent to the a/c by H/F W/T. By this time in WW2 most a/c were equipped with the TR 1154/1155 radio sets. A good piece of kit!!
    HTH
    Peter Davies
    Last edited by Resmoroh; 27th April 2015 at 12:15. Reason: QSD
    Meteorology is a science; good meteorology is an art!
    We might not know - but we might know who does!

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    Hello

    You're right about A.P. A standing for Aiming Point A. In some raids, there were several aiming points and they were just differentiated / named that way.

    K and L are just the references of the lines of the document, which was sent by telex (teleprinter at the time), and when some corrections needed to be sent, it was probably easier to refer to the line reference and give the correction. In these telexes, the letters and their meaning were always the same. One was for the target another was for time of over target, route in (to the target), route out (from the target), height of bombing, bombs loads, type of PFF marking, etc... You have in your other document the rate at which the window bundles should have been dropped. So plenty of informations for the organisation of the raid.

    In the target codes, G stands for Germany. The other reference must apply to a map or illustrated picture and look like coordinates or description of the illustrated picture. I've seen such volumes for northern France in Kew, and the numbering system is similar. Can't say whether it applies to your research or not

    Good luck

    Joss

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    Z equipment was an infra red recognition system to enable bombers fitted with AGLT on their turrets, radar directed gun laying, to identify friendlies. The system was theoretically good enough to fire "blind" so a means of preventing "blue on blue`' to use the awful modern phrase was needed.
    On say a Lancaster, this can be recognised by the two metal circles on the middle of the bomb aimers blister window, which were the transmitters for the system and would flash a code on the infra red band and identify the aircraft as friendly. More correctly I believe the gun sight for the turret was fitted with an infra red telescope that enabled the gunner to read the code. In practice this made the system a little slow in combat situations and gunners were therefore reluctant to fire blind, so use of this system was I believe fairly restricted and only used in certain circumstances, one of which you may be looking at.
    If you want to see this I believe the RAF Museums Sugar is still fitted with this.
    cheers Peter
    Last edited by PeterColwill; 28th April 2015 at 14:25.

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    RAS generally stands for Rectified Airspeed..........which for various reasons isn't used much anymore.

    It means the Indicated Airspeed as read off the airspeed indicator corrected for......

    1 Instrument error...........errors caused by the ASI itself due to its construction

    2 Position error................errors due to the position of the pitot head on the airframe or induced by manoeuvring of the aircraft

    At least something like that ! its a long time ago...........the answer is b !

    If thats what is meant by RAS in your tactics, can only presume its a way of keeping everyone at the same speed, although seemingly a bit nitpicking rather than using just IAS.

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    Today RAS is known as IAS, with a capitol I. The instrument, as read, is iAS (lower case i). I'm not sure what term was used for iAS in the UK at this time, but several aircraft at the same iAS could be travelling at different IAS, because each airspeed indicator might have different errors. Only a knot or two different, but this could make a difference over a flight of several hours.

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    Default Target codes GY. GZ. GR

    Thanks for al the information, I found a lot of city/area codes in the book "The strategic Air offensive against Germany vol IV"
    maybe the are helpful for someone. I still need to find GH.611 and GH.628



    Code City Deteailed Extra
    GY.4796 Leipzig Heiterblick Me.109
    GY.4825A Leipzig Mockau
    GY.4847 Leipzig Abtaundorf
    GY.4828A Regensburg Frufening Me.109
    GY.4863 Kreisling FW.190
    GH.630C Posen
    GY.4752A Augsburg Me.410
    GY.4765 Gotha Me.110
    GY.4835 Bernburg Ju.88
    GY.4822 Halberstadt
    GY.4818 Aschersleben
    GY.4775 Brunswick Wilhelmitor Me.110
    GY.4842 Neupritor
    GU.4155 Tutow FW.190
    GY.4809A Kassel Waldau FW.190
    GN.3834 Steyr Me.109
    GY.4850 Wiener-Neustadt Fischamend Me.109
    GY.4806 Schkeuditz Ju.88
    BH.93 Budapest Szigetszentmiklos Me.410
    GY.4855 Schwechat He.219
    GZ.2707A Schweinfurt KGF
    GZ.2707E Schweinfurt VKF
    GZ.2714 Berlin Ekner VKF
    GN.3834A Steyr Steyr Werke I
    GN.3834B Steyr Steyr Werke II
    GZ2703 Leipzig DFK
    GZ2704 Stuttgart Bad Canstatt
    GZ2701 Wuppertal Jaegar
    Z.431 Trappes Marshalling Yards
    Z.599 Aulnoye Marshalling Yards
    Z.444 Le Mans Marshalling Yards
    Z.446 Amiens Longenau Marshalling Yards
    ZB.866 Courtrai Marshalling Yards
    Z.604 Laon Marshalling Yards
    Z.745 Montdidier Airfield
    Z.186 Le Creusot Schneider Armament and Locomotive Works
    Z.284 Paris Quai de Javel Citroen works
    Z.594 Gien Ordenance depot
    GY.4793 Warnemunde Me.109
    GS.162 Huls Syntetic rubber
    GO.1236 Qudrath Quadrath Fortuna Powerworks
    GO.1237 Koln Knapsack Goldenberg Werk
    GO.1428 Koln Brauweiler Powerplant
    GO.1128 Stockum Gersteinwork
    GQ.1509 Gelsenkirchen Synthetic oil
    GQ.1537 Gelsenkirchen Gelsenberg Benzin A.G.
    GQ.1510 Wesserling Union Rheinischen Braunkohln Wesserling
    GS.153 Merseburg Syntetic rubber
    GZ.2804 Frankfurt Hedernheim VDM
    GB.3280 Stuttgart Fuerbach Robert Bosch
    GQ.1515 Merseburg Leunawerke
    GR.3589 Kiel Germania Werft
    GR.3588 Kiel Deutsche Werke
    GR.3594 Kiel Havaldtwerke
    GR.3586 Bremen Deschimag
    GR.4772 Bremen Focke Wulf Factory
    GR.3693 Vegesack Vulcan Werke
    GR.3587 Hamburg Blohm & Voss
    GY.4761 Hamburg Havaldts
    GZ.2833 Augsburg Diesel engine factory
    GR.3665 Mannheim
    GY.4679 Dessau Ju88 factory
    Z.202 Bordeaux Merignac Focke Wulf Aerodrome
    SN.25 Stavanger Focke Wulf Aerodrome
    GR.3672 Koln Submarine Batteries
    GR.3816 Koln Dieselengines
    GR.3658 Hagen Dieselengines
    GR.3669 Stuttgart Dieselengines
    GY.4654 Stuttgart Dieselengines
    GR.3280 Stuttgart Bosch
    GR.3282 Stuttgart Bosch

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    Hi Hans,

    GH611 = rail traffic centre Krefeld
    GH628 = railway marshalling yard Koblenz

    Regards,
    Hans

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    Thanks Hans,
    Were did you get this info..When I work my selft throug the flight details of the KEW archives I keep finding target codes which I can't place

    GH.559 - I Think these are the marshalling yards at Vohwinkel
    GH.363 - Marshalling Yards near Recklinghausen
    GH.612A - ?
    GH.5531 - ?
    GH.611 - I Think this is the marshalling yards somewhere near Euerdingen
    GO.1462 - ?
    GS.38 - ?
    GZ.2791 - ?

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    Default Target codes

    Hi Hans,

    See below.

    Quote Originally Posted by spijkerfestijn View Post
    Thanks Hans,
    Were did you get this info.
    By visting the Archives for over 25 years now When I work my selft throug the flight details of the KEW archives I keep finding target codes which I can't place

    GH.559 - I Think these are the marshalling yards at Vohwinkel Correct
    GH.363 - Marshalling Yards near Recklinghausen Correct
    GH.612A - Railway Traffic Centre Neuss
    GH.5531 - Not found. Sure about the code?
    GH.611 - I Think this is the marshalling yards somewhere near Euerdingen marshalling yards Krefeld
    GO.1462 - Grid and transformer station Koblenz
    GS.38 - I.G. Farbenindustrie A.G. Ludwigshafen-Oppau
    GZ.2791 - Ruhrstahl A.G. Witten
    Regards, Hans

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