So to get things spinning up,
 
I'm not sure whether these P-400s have come to light on this site:
 
AP377 40thPS/35th PG Project X 11/02/42 to Aust 05/03/42 R14/05/42 off Sumac 26/10/44 Pilot baled out during combat over Buna Bay 06/07/42. Pilot 2nd Lt Howard C Welker 0-427069 killed as chute did not open.
 
BW169 39thPS/35th PG Project X 21/01/42 to Aust 22/02/42 R14/05/42 off Sumac 26/10/44.2nd Lt Carl T. Rauch O-428228 bailed out North of Port Moresby  Jun 18, 1942.
 
BW129 35thPG Project X 23/02/42 to Aust 04/04/42 R14/05/42 2nd Lt Clarence  Wilmarth O-420792 MIA 02/07/42 in PNG, to/From Lae.Condemned off Sumac 03/07/43 off Sumac 29/03/44
 
AP348 39thPS /35thPG Project X 23/02/42 to Aust 04/04/42 R14/05/42 off Sumac 26/10/44 1st Lt Thomas Lynch bailed out at 800' Between RIGO and PORT MORESBY 16/06/1942
 
AP361 39thPS/35th PG Project X 11/02/42 to Aust 05/03/42 R14/05/42  off Sumac 25/10/44 2nd Lt Joe Greene bailed out near 14-Mile Drome 18/06/42
 
BW105 Project X 11/03/42 to Aust 04/04/42 R14/05/42 Condemned off Sumac 07/09/42 off Sumac 29/03/44 2nd Lt Herbert H Hill shot down over Buna 22/11/1942
 
And one not in PNG but Charters Towers NthQLD:
 
BW168 39thPS/35thPG-35th FS/8th FG "E"/"A"/ #33 Project X 21/01/42 to Aust 22/02/42 crashed before delivery<4/42, but repaired.R14/05/42 Condemned off Sumac 09/01/43 2Lt Harry Walker KIA Landing Charters Towers Airfield Pilot error.
 
I have passed some of these onto Joe Baugher.
 
Best
Gordy

P-400 contribution:
 
BX-170, Burhus, John L, 420830, Tontouta airfield , Service # O-023472, 67PS ?, 347PG ? (not sure on these) 13AF, DNB, Condemned Aug 30, 1942,  September 1. 1942. “Yesterday our former squadron commander (69th BG, B-26 ) of a month ago, Captain Burris, (sic) was killed in a P-400 fighter (lend lease el cheapo version of the P-39) at Tontouta airfield about 15O miles away. He was testing the aircraft and after takeoff the Curtis Electric “uncontrollable “propeller ran away and he lost so much power that he couldn’t make a turn back to the field and tried to set it down in a small field but lacked the flying speed and crashed in flames. The fire fighters couldn’t get near the wreckage for 20 minutes.our squadron is to fly formation over his grave today at 2:15 p.m. following services”. Hometown: McIntosh County, OK
 
AH-573, Wg Cdr W.S. Jenkins, 420211, Boscombe Down, Wilts, A & AEE TP, RAF, DNB, Crashed Feb 11, 1942 from Boscombe Down.  Engine failure just after takeoff. Pilot killed.AH573 was one of the first Airacobras ( Bell Model 14s ) which arrived in July 1941 and went to the Aeroplane and Armament Experimental Establishment ( A & AEE) at Boscombe , others  went to  the Air Fighting Development Unit ( AFDU ) at Duxford ( where 601 was stationed ) . AH573 was used for trials with various exhaust systems ( 601s Airacobra Is had fish-tail ports fitted over the original kidney types) . By the time it was lost in Feb. ,601 Sqn. had finished operations and the month before moved up north to Acaster Malbis (Yorkshire) still persevering with their Airacobras; they gave them up in March and converted to Spitfire Vs. The pilot was probably RAF but possibly civilian as there were many at Boscombe.I think the P-400 designation was for those either transferred from the British or retained by the AAF ; they had a 20mm cannon and 6 x 0.303 m/gs. February 11, 1942
TAKE-OFF POINT: Not yet known
CRASH LOCATION: Boscombe Down, Wilts
AIRCRAFT TYPE & SERIAL: Bell Airacobra Mk I
CREW FATALITIES: Wg Cdr W.S. Jenkins, A&AEE TP
PURPOSE OF TEST FLIGHT: —
ACCIDENT DETAIL: Engine failed at 600ft after take-off, pilot attempted to return but lost control and spun-in on to airfield.

http://www.geocities.com/raf_112_sqdn/

Appreciated.

We have more in common too then you realise. Per DAF No3 Sqn RAAF and No 450 Sqn (RAF) RAAF. 

IE: ET919 H-87A-3 6 Gun 450Sqn RAF(RAAF) Code OK-T ex 250 Sqn., to 112 Sqn.GAC later Coded GA-T, 41-36273 to RAF as ET919. Wrecked when crash landed at El Imayed following flak damage Oct 7, 1942.

IE: Per "London Pride": BURNEY Henry George - (Pilot Officer); Service Number - 402343;  Casualty .Aircraft - Kittyhawk AK 772; Place - Middle East; Date - 30 May 1942

So I guess if you're interested, refer ADF-Serial .com.au per contact. Not Gordon C but GordyB

Best
Gordy

More on Burney;

Source; http://www.mts.net/~robhd1a/planelosses.html
 Tomahawk Mk. IIB AM 390 GA W, Sgt Henry George Burney, 402343, RAAF, 22/11/41, Aircraft crash landed near El Adem after being damaged in dogfight, with I and II/JG27,Wg Cmdr Fred Rosier landed a Hurricane to help him, burst a tire and both walked 30 miles back took 3 days was the planes first combat flight

 
Kittyhawk Mk. I, AK772/GA Y, photo page 2, Plt Off Henry George (Tom) Burney, 402343, RAAF, 30/5/42, A/C (London Pride) missing near point 359412 may have been Rudolf “Rudi” Sinner Stab I./JG 27 Bir-el-Harmat, pilot KIA, mentioned in Brian M Thompson 3 Sqdn war diary

More P-400 serails and details found on http://www.geocities.com/raf_112_sqdn1/350thfghonor_roll.html  and http://www.geocities.com/raf_112_sqdn1/81stfghonor_roll.html

Regards
Rob

http://www.geocities.com/raf_112_sqdn/