It’s okay! I found it on the other thread where Dave had cleverly included the scan of AP.1086.
65A is Claudel Hobson.

Bruce, you owe me a beer!
We went through this on P+Ps thread asking about Mosquito IDs.
DHP is found all over Vampire parts built in both Australia and the UK.
From Day 1 all single-seat Vampire parts with DH part numbers were made at Bankstown, NSW, Australia. This is described in the monthly reports from DHA to the Department of Supply. These reports, month by month, tell how many drawings have been received from the UK, how much production planning has been completed on detail parts, how many tools have been made, etc. Those of us who are interested enough and live here and worked for the company in the very hangar where all the parts were made know well enough where exactly, for example, the cast aluminium parts were made, where the massive rubber press was, etc. Out of all of the Australian production of Vampires, Single-seaters and trainers, the only 00, 12, 13 or 15 parts that were documented as being supplied to Australia to support local production that were made elsewhere, was the 7 (or 15? I can’t remember) T.33 Fuselages that came from the UK. (It would be interesting to know at this point in time how common they were to the T.11s or T.22s – variations in instrument panel fitout and some equipment, I guess.). All of the Australian parts have DHP all over them, both single-seater and trainer.
I don’t know which country flyingblind found his y-brace in, but I didn’t think there was any suggestion that it came from Australia or Rhodesia!
At this point in time, I have heard that sanction busting led to Rhodesian Vampires having some parts from France, but there is no doubt that the wings that came with FB.9 R1382 where not made in Australia and have DHP stamped all over them. I know they are not Australian built because I know what the Australian wing serials are, and the Rhodesian wings have serials that have no resemblance to the Australian ones. Considering the number of options available to the Rhodesians, I doubt that they would have sourced parts in Australia. It would be interesting to know if someone has something to say about the Australian political view at the time. Note that Rhodesia had sourced the Reims-Cessna Lynx aircraft at that time direct from France.

Presumably at some point mod and revision systems were fairly simple, but here is a general run-down. You will have a drawing office register. Revisions to a drawing that do not have a ‘form, fit, function’ change, such as correcting drafting errors that don’t cause parts to be made incorrectly, then the revision explanation may only appear in the drawing office register. Some revisions do have explanations on the drawings regardless of the extent of the change. For a minor change there may well be other records because, for example, the production office may generate engineering requests for drafting corrections or alternative materials, etc, that are sent to the drafting office.

Form, fit, function changes may be made by mod or part-number change. There are production mods and service mods. Production mods and service mods may have the same number and may have a manufacturer’s number and an RAF number. On the Vampire for example, the DH mod numbers start with a V, and if the mod is the same for production and service aircraft, the V number is the same (although the instructions on how to implement may be different). The DH issuance of the mods are through the Technical News Sheets. I’m not sure if RAF mod instructions (in the 1950s, this was Vol.2 of the AP) cross-reference to the manufacture’s number (if different), but I know that the RAAF APs of the time do list both. Mods generally are much better documented. Mods are coordinated between the manufacturer and the air force by a ‘mod committee’. And air force notes on review and planned incorporation of mods wind up in the national archives.

In the case of the Vampire, both DH and air force style of mod numbers may appear on the mod plates on the aircraft.

Apart from Vampire, I’m aware that you can find mod folders for aircraft such as the Beaufighter (Bristol and DAP, though for the former coverage is probably limited to what is relevant to the marks used by the RAAF aircraft) through the on-line search at the National Archives of Australia website. Some documents are already digitised and can be down-loaded. For earlier types, I do not know what is available, but worth searching!
https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/SearchScreens/BasicSearch.aspx

Cheers.

Also used on Venom and Sea Venom.

Here are three photos of a Beaufighter Mk.21 Observer’s seat. In the background is a British built Observer’s seat – this would have come from an RAAF British-built Beau.
Sorry the UK-built seat wasn’t actually the subject of any of my photos, but you can see how it looks kinda the same, but definitely different. Earlier or later version?

[ATTACH=CONFIG]258224[/ATTACH] [ATTACH=CONFIG]258225[/ATTACH] [ATTACH=CONFIG]258226[/ATTACH]

Hi Alan.
Ignoring the faint ‘2’, the part number becomes 13CE177. This means it would be Vampire NF. CE is Controls Engine.
From the photos above showing the whole box, I can’t tell if this is right, but I guess as they are oriented in the photo on the right, we would be looking aft if you can imagine them fitted in the aircraft.
Cheers.

Could it be a Navigator’s or Co-pilot’s/student’s panel?