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Description
Rebuilt variant of the B-17 into an early AWACs platform

Changes include:
Replacing the four Wright Cyclones with 2 Allison T-38 turboprops (rated 2500 shp each)
Adding inflight refueling receptical

Chin turret removed.
Norden bombsight removed.
Bombardier’s station retained as a look out post, while on ASW or airborne search and rescue (SAR) missions.
Top forward turret removed.
Cockpit armour removed.
300 U.S. Gallon drop tanks fitted under the outer wings.
Extra fuel tanks in the outer wings (“Tokyo Tanks”).
AN/APS-20 Seasearch S-band Radio Detection and Ranging (RADAR), with transmitter in the fuselage and aerial in a bulbous di-electric fairing under the former bomb-bay.
Modernised Identification, Friend or Foe (IFF).
Radio Direction Finder (RDF).
Instrument Landing System (ILS).
LOng RAnge Navigation (LORAN).
2 RADAR consoles facing aft in the former bomb-bay
Radio Operators seat turned to face outboard.
Waist gun positions and ball turret removed.
Bench seats fitted for observers at the waist positions.
Floating smoke markers carried.
A latrine and a galley were fitted amidships.
Tail guns and armour removed.
Provision for spares and/or cargo to be carried in the tail section.
(From Wikipedia PB-1 and PB-1W)

Description
Rebuilt variant of the B-17 into an early AWACs platform

Changes include:
Replacing the four Wright Cyclones with 2 Allison T-38 turboprops (rated 2500 shp each)
Adding inflight refueling receptical

Chin turret removed.
Norden bombsight removed.
Bombardier’s station retained as a look out post, while on ASW or airborne search and rescue (SAR) missions.
Top forward turret removed.
Cockpit armour removed.
300 U.S. Gallon drop tanks fitted under the outer wings.
Extra fuel tanks in the outer wings (“Tokyo Tanks”).
AN/APS-20 Seasearch S-band Radio Detection and Ranging (RADAR), with transmitter in the fuselage and aerial in a bulbous di-electric fairing under the former bomb-bay.
Modernised Identification, Friend or Foe (IFF).
Radio Direction Finder (RDF).
Instrument Landing System (ILS).
LOng RAnge Navigation (LORAN).
2 RADAR consoles facing aft in the former bomb-bay
Radio Operators seat turned to face outboard.
Waist gun positions and ball turret removed.
Bench seats fitted for observers at the waist positions.
Floating smoke markers carried.
A latrine and a galley were fitted amidships.
Tail guns and armour removed.
Provision for spares and/or cargo to be carried in the tail section.
(From Wikipedia PB-1 and PB-1W)