Modifications to this production-block

Additions of enclosed radio compartment gun with K-5 mount from 43-38274, Chenyenne tail gun with N-8 sight from 43-38473, SCR-522 VHF radio from 43-38174, RC-103 Group ‘B’ parts from 43-38174, outside release handles for life raft, cockpit hot air heating system, duplication of bomb release wiring, changes to landing gear retracting units, AN/ARN-7 radio compass and Group ‘A’ parts AN/ARN-5 glide path receiver added.

B-17 Flying Fortresses in this production-block