Boeing 707 version codes

To retain my sanity, I have only listed the civilian variants. The number of military variants is still growing as new applications are found for the basic platform.

Never built variants in italics.

367-80 Prototype Test Bed. 127’10” length. 130′ span. 11′ fuselage width. Prototype for both the 707 (civilian) and KC-135 (military) variants and narrower in cross section than both the production lines.
707-120 Basic 145’1″ length. 130’10” span. 12’4″ inches fuselage width.  P&W JT3C-6 turbojets.
707-320 Stretch 152’11” length. 142’5″ span. 12’4″ inches fuselage width. P&W JT4A turbojets.
707-220 Reeingined 120 145’1″ length. 130’10” span. 12’4″ inches fuselage width.  P&W JT4A-3 turbojets.
707-420 Reengined 320 152’11” length. 142’5″ span. 12’4″ inches fuselage width. RR Conway Mk508 turbofans.
720 Shrink Shorter-range shrink. 136’9″ length. 130’10” span. 12’4″ fuselage width. P&W JT3C turbojets.
720B Reeingined 720 136’9″ length. 130’10” span. 12’4″ fuselage width. P&W JT3D turbofans.
707-120B Reengined 120 145’1″ length. 130’10” span. 12’4″ inches fuselage width.  P&W JT3D turbofans.
707-320B Modified and reengined 320 Increased wing span, modified wing devices, increased MTOW. 152’11” length. 142’8.5″ span. 12’4″ inches fuselage width. P&W JT3D turbofans.
707-320C Convertible 320 320B with stronger floor and cargo door. Could be used for passengers, cargo, or both. 152’11” length. 142’8.5″ span. 12’4″ inches fuselage width. P&W JT3D Turbofans.
707-700 Reengined 320C Only one built (converted 320C) to test validity of high-bypass turbofans on the airframe. Cost of conversion to new engines found unjustified for new production aircraft. 152’11” length. 142’8.5″ span. 12’4″ inches fuselage width. CFG-56 turbofans.
707-520 Reengined 120 Reengined 120 with RR Conway 10 engines.
707-520B 320B stretch 2′ stretch of the 320B with JT3D-5A turbofans.
707-620 120 Stretch 10′ stretch of the 120 with Bristol 511 engines.
707-720 320 with IGW Increased Gross Weight variant of the 320 with Bristol 511 engines.
707-320-101 320 with enlarged lower lobe 320 with an enlarged lower lobe for passenger seating on a lower deck forward of the wing and more cargo aft of the main gear.
707-520-X Double decker development Double decker with low wing. Length 191’7″.
707-520-2X 520-X shrink Double decker with low wing. Shorter than the above.
707-520-X3 Double decker development Double decker with high wing. Length 144’2″. Span 142’5″.
735 and 738 Swing tail cargo variants 735 had an upward swinging tail and 738 a sideways swinging one. Both enabled cargo loading through the resultant opening.

 

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