Depends on the model. Convair-built Juliets had the nose door retract inward until they switched to the J-70-CF model, when they were switched to outward doors. North American-built Juliets all used outward doors, while the Consolidated-built AC usually had outward doors with a few exceptions.
On checking the serial number against Baugher's records, I discovered an art bug: no such number exists. 42-521699 is one digit longer than any typical serial number. The closest one (42-52169) was not a J, but a Ford-built B-24H-10-FO lost over Brunswick on 8 May 1944. Records of the 453rd Bomb Group support this. Either the B-24 designation is wrong (should be H instead of J) or the serial number and nose art are off. Ford-built B-24s all had outward opening nose doors, just so ya know.
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Flakbait [Delta6]
