TCDS A-763

Page No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Rev. No. 19 18 18 18 14 16 18 18 18 18 14 18 18 14 18 18 10 10 16 18 DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION A-763 Revision 19 LOCKHEED 49-46 149-46 649-79 649A-79 749-79 (C-121A, VC-121B) 749A-79 July 23, 2012 AIRCRAFT SPECIFICATION NO. A-763 This data sheet which is part of Type Certificate No. A-763 prescribes conditions and limitations under which the product for which the type certificate was issued meets the airworthiness requirements of the Civil Air Regulations. Type Certificate Holder Lockheed Martin Aeronautics Company 86 South Cobb Drive Marietta, GA 30063 Type Certificate Holder Record Lockheed Aircraft Corporation Burbank, California I - Model 49-46, Approved October 14, 1946 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 745C18BA- 3 with 16:7 reduction gear ratio. Fuel AN grade 100/130. Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 43.5 in.hg., 2400 rpm (2000 hp) (Straight line manifold pressure variation with altitude to 4800 ft.) 41.5 in. hg., 2400 rpm (2000 hp) Take-off (two minutes): (Sea level) 46.0 in.hg., 2800 rpm (2200 hp) (Straight line manifold pressure variation with altitude to 6300 ft.) 44.0 in.hg., 2800 rpm (2200 hp). High impeller ratio 8.67:1 Maximum continuous: (8000 ft.) 43.0 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure varia tion with altitude to 15000 ft.) 40.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10,600 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure variation with altitude to 16200 ft.) 42.0 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boot s installed - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. (*Note: When airspeed instrument (0-305 mph) is installed, the above-noted glide or dive speed should read 305 mph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) A-763 2 With Speedpak and/or deicer boots inst alled - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. Usable ceilings See Approved Oper ating Manual (enroute climb curve). C.G. range See NOTE 1(b) for require d loading and gear retraction moment. Condition Weight Landing Fwd. Limit Aft. Limit lbs. gear sta. %MAC sta. %Mac Take-off 90,000 Down 535.7 20.3 556.4 32.0 77,800 Down 531.7 18.0 556.4 32.0 or less Landing 77,800 Down 531.7 18.0 556.4 32.0 or less Cruising 90,000 Up 531.1 17.7 556.4 32.0 Flight 77,800 Up 526.4 15.0 556.4 32.0 or less Weight limits Landing: 75,000 lbs. Take-off: 86,250 lbs. (Dump valves are required) 3-engine ferrying: 80,000 lbs. See NOTE 11 for other conditions applicable. See NOTE 7 regarding eligibility for higher weights. Minimum crew 3, Pilot and Copilot at +190 and Flight engineer at +226. Passengers Maximum 60 (CAR 4b.3812). See Appr oved Weight and Balance Report for actual number and location. Baggage See NOTE 4. Fuel capacity 2 inboard tanks (790 gal. ea.) 9,480 lbs. (+563). 2 inboard tanks (1,555 gal. ea.) 18,660 lbs. (+558). See NOTE 5 regarding "System Fuel and Oil". Oil capacity 2 inboard tanks (45 gal. ea.) 675 lbs. (+495) 2 outboard tanks (45 gal. ea.) 675 lbs. (+520). Control surface movements Main surfaces (booster pressure on) - Elevator 40° up 20° down Aileron 25° up 9° down Rudder 30° right 30° left Tabs (main surfaces in neutral) Elevator 22° up 22° down Aileron 12° up 12° down Rudder 25° right 25° left Flaps - 41° total angular travel. Serial Nos. eligible 1963 to 1965 inclusive, 1967 to 1971 inclusive, 1974 to 1980 inclusive, and 2021 to 2088 inclusive. Required equipment Items 1a or e; 101(a); 200(a), (b) or (c ); 201(a), (b), (c), (d), (e), (f) or (g); 202(a), (b), (c) or (d); 203(b) or (e); 205(a), (b), (c) or (d); 206(c) or (d); 508; 600; 601. II - Model 649-79, Approved March 14, 1947 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 749 C18B D-1 with 16:7 reduction gear ratio. Fuel AN grade 100/130. Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 44.0 in.hg., 2400 rpm (2100 hp) (Straight line manifold pressure variation with altitude to 4400 ft.) 42.5 in. hg., 2400 rpm (2100 hp) Take-off (two minutes): (Sea level) 51.5 in.hg., 2800 rpm (2500 hp) (Straight line manifold pressure variation with altitude to 3100 ft.) 51.0 in.hg., 2800 rpm (2500 hp). 3 A-763 High impeller ratio 8.67:1 Maximum continuous: (9000 ft.) 42.5 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure variation with altitude to 16000 ft.) 41.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10800 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure variation with altitude to 15700 ft.) 43.5 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boot s installed - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. (*Note: When airspeed instrument (0- 305 mph) is installed, the above-noted glide or dive speed should read 305 mph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) With Speedpak and/or deicer boots inst alled - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. Usable ceilings See Approved Oper ating Manual (enroute climb curve). C.G. range See NOTE 1(b) for required loading and gear retraction moment. Condition Weight Flap Landing Fwd. Limit Aft. Limit lbs. Position gear sta. %MAC sta. %Mac Take-off 94,000 Takeo ff Down 535.2 20.0 556.4 32.0 Climb or cruise 84,500 Ta keoff Down 531.7 18.0 556.4 32.0 or less Straight line variation between above listed values. Climb or cruise 94,000 Up Up 529.9 17.0 559.9 34.0 84,500 Up Up 526.4 15.0 559.9 34.0 or less Straight line variation between above listed values. Landing 84,500 Down Down 531.7 18.0 556.4 32.0 o r l e s s Weight limits Landing: 84,500 lbs. Take-off: 94,000 lbs. (Dump valves are required) 3-engine ferrying: 80,000 lbs. See NOTE 11 for other conditions applicable. Minimum crew 3, Pilot and Copilot at +190 and Flight engineer at +226. Passengers Maximum 60 (CAR 4b.3812). See Appr oved Weight and Balance Report for actual number and location. Baggage See NOTE 4. Fuel capacity Tanks 2 and 3 (inboa rd) (790 gal. ea.) 9,480 lbs. (+563). Tanks 1 and 4 (outboard) (1 ,555 gal. ea.) 18,660 lbs. (+558). See NOTE 5 regarding "System Fuel and Oil". Oil capacity With Item 1(b) or (f) propeller - 2 inboard tanks (56 gal. ea.) 840 lbs. (+455) 2 outboard tanks (56 gal. ea.) 840 lbs. (+474). A-763 4 With Item 1(d), (e) or (g) propeller - 2 inboard tanks (54 gal. ea.) 810 lbs. (+455). 2 outboard tanks (54 gal. ea.) 810 lbs. (+474). Control surface movements Main surfaces (booster pressure on) - Elevator 40° up 20° down Aileron 25° up 9° down Rudder 30° right 30° left Tabs (main surfaces in neutral) Elevator 22° up 22° down Aileron 12° up 12° down Rudder 25° right 25° left Flaps - 41° total angular travel. With Model 49 flaps installed in accordance with LAC Dwings 251010, 251011 and 273326, flap movement is reduced to 41 . Serial Nos. eligible 2501 and up Required equipment 1b, d, e, f or g; 101(b) or (c); 108(b); 200(b); 201(f) or (g); 202(a), (b), (c) or (d); 203(b) or (e); 205(b), (c) or (d); 206(c) or (d); 508; 600; 601. III - Model 749-79 (Army C-121A, VC-121B - See NOTE 16), Approved March 14, 1947 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 749C18BD- 1 with 16:7 reduction gear ratio. Fuel AN grade 100/130. Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 44.0 in.hg., 2400 rpm (2100 hp) (Straight line manifold pressure vari ation with altitude to 4400 ft.) 42.5 in. hg., 2400 rpm (2100 hp) Take-off (two minutes): (Sea level) 51.5 in.hg., 2800 rpm (2500 hp) (Straight line manifold pressure vari ation with altitude to 3100 ft.) 51.0 in.hg., 2800 rpm (2500 hp). High impeller ratio 8.67:1 Maximum continuous: (9000 ft.) 42.5 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure vari ation with altitude to 16000 ft.) 41.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10800 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure vari ation with altitude to 15700 ft.) 43.5 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boots installed - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. (*Note: When airspeed instrument (0-305 mph) is installed, the above-noted glide or dive speed should r ead 305 mph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) With Speedpak and/or deicer boots inst alled - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. Usable ceilings See Approved Oper ating Manual (enroute climb curve). C.G. range See NOTE 1(b) for require d loading and gear retraction moment. 5 A-763 Condition Weight Flap Landing Fwd. Limit Aft. Limit lbs. Position gear sta. %MAC sta. %Mac Take-off 102,000 Takeo ff Down 537.0 21.0 556.4 32.0 Climb or cruise 94,000 Takeoff Down 535.2 20.0 556.4 32.0 84,500 Takeoff Down 531.7 18.0 556.4 32.0 or less Straight line variation between above listed values. Climb or cruise 102,000 Up Up 532.6 18.5 559.9 34.0 94,000 Up Up 529.9 17.0 559.9 34.0 84,500 Up Up 526.4 15.0 559.9 34.0 or less Straight line variation between above listed values. Landing 84,500 Down Down 531.7 18.0 556.4 32.0 o r l e s s Weight limits Landing: 84,500 lbs. (See NOTE 17) Take-off: 102,000 lbs. (Dump valves are required) 3-engine ferrying: 80,000 lbs. S ee NOTE 11 for other conditions applicable. Minimum crew 3, Pilot and Copilot at +190 and Flight engineer at +226. Passengers Maximum 60 (CAR 4b.3812). See Appr oved Weight and Balance Report for actual number and location. Baggage See NOTE 4. Fuel capacity Tanks 2 and 3 (inboa rd) (790 gal. ea.) 9,480 lbs. (+563). Tanks 1 and 4 (middle) (1,555 gal. ea.) 18,660 lbs. (+558). Tanks 2a and 3a (outboard) (565 gal. ea.) 6,780 lbs. (+560). See NOTE 5 regarding "System Fuel and Oil". Oil capacity With Item 1(b) or (f) propeller - 2 inboard tanks (56 gal. ea.) 840 lbs. (+455) 2 outboard tanks (56 gal. ea.) 840 lbs. (+474). With Item 1(d), (e) or (g) propeller - 2 inboard tanks (54 gal. ea.) 810 lbs. (+455). 2 outboard tanks (54 gal. ea.) 810 lbs. (+474). Control surface movements Main surfaces (booster pressure on) - Elevator 40° up 20° down Aileron 25° up 9° down Rudder 30° right 30° left Tabs (main surfaces in neutral) Elevator 22° up 22° down Aileron 12° up 12° down Rudder 25° right 25° left Flaps - 45° total angular travel. With Model 49 flaps installed in accordance with LAC Drawings 251010, 251011 and 273326, flap movement is reduced to 41. Serial Nos. eligible 2501 and up Required equipment Items 1b, d, e, f or g; 101(d) or (e); 108(b); 200(b); 201(f) or (g); 202(a), (b), (c) or (d); 203(b) or (e); 205(b), (c) or (d); 206(c) or (d); 508; 600; 601. IV - Model 149-46, Approved March 18, 1948 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 745C18BA- 3 with 16:7 reduction gear ratio. Fuel AN grade 100/130. A-763 6 Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 43.5 in.hg., 2400 rpm (2000 hp) (Straight line manifold pressure variation with altitude to 4800 ft.) 41.5 in. hg., 2400 rpm (2000 hp) Take-off (two minutes): (Sea level) 46.0 in.hg., 2800 rpm (2200 hp) (Straight line manifold pressure vari ation with altitude to 6300 ft.) 44.0 in.hg., 2800 rpm (2200 hp). High impeller ratio 8.67:1 Maximum continuous: (8000 ft.) 43.0 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure vari ation with altitude to 15000 ft.) 40.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10,600 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure vari ation with altitude to 16200 ft.) 42.0 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boots inst alled - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. (*Note: When airspeed instrument (0-305 mph) is installed, the above-noted glide or dive speed should read 305 mph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) With Speedpak and/or deicer boots inst alled - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. Usable ceilings See Approved Oper ating Manual (enroute climb curve). C.G. Range See Note 1(b) for require d loading and gear retraction moment. Condition Weight Flap Landing Fwd. Limit Aft. Limit lbs. Position gear sta. %MAC sta. %Mac Take-off 100,000 Takeo ff Down 537.0 21.0 556.4 32.0 Climb or cruise 93,000 Takeoff Down 535.2 20.0 556.4 32.0 83,000 Takeoff Down 531.7 18.0 556.4 32.0 or less Straight line variation between above listed values. Climb or cruise 100,000 Up Up 532.6 18.5 559.9 34.0 93,000 Up Up 529.9 17.0 559.9 34.0 83,000 Up Up 526.4 15.0 559.9 34.0 or less Straight line variation between above listed values. Landing 83,000 Down Down 531.7 18.0 556.4 32.0 o r l e s s Weight limits Landing: 83,000 lbs. Takeoff: 100,000 lbs. (Dump valves are required) 3-engine ferrying: 80,000 lbs. See NOTE 11 for other conditions applicable. See NOTE 7 regarding eligibility for above weights. Minimum crew 3, Pilot and Copilot at +190 and Flight engineer at +226. 7 A-763 Passengers Maximum 60 (CAR 4b.3812). See Appr oved Weight and Balance Report for actual number and locations. Baggage See NOTE 4. Fuel capacity Tanks 2 and 3 (inboa rd) (790 gal. ea.) 9,480 lbs. (+563). Tanks 1 and 4 (middle) (1 ,555 gal. ea.) 18,660 lbs. (+558). Tanks 2a and 3a (outboard ) (565 gal.ea.) 6,780 lbs. (+560). See NOTE 5 regarding "System Fuel and Oil". Oil capacity 2 inboard tanks (45 gal. ea.) 675 lbs. (+495) 2 outboard tanks (45 gal. ea.) 675 lbs. (+520). Control surface movements Main surfaces (booster pressure on) - Elevator 40° up 20° down Aileron 25° up 9° down Rudder 30° right 30° left Tabs (main surfaces in neutral) Elevator 22° up 22° down Aileron 12° up 12° down Rudder 25° right 25° left Flaps - 41° total angular travel. Serial Nos. eligible 1963 to 1965 inclusive, 1967 to 1971 inclusive, 1974 to 1980 inclusive, and 2021 to 2088 inclusive. Required equipment Items 1a or e; 101(f); 200(b); 201 (f) or (g) (See NOTE 15); 202(a), (b), (c) or (d); 203(b) or (e); 205(b), (c) or (d); 206(c) or (d); 508; 600; 601. V - Model 749A-79, Approved February 15, 1949 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 749 C18B D-1 with 16:7 reduction gear ratio. Fuel AN grade 100/130. Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 44.0 in.hg., 2400 rpm (2100 hp) (Straight line manifold pressure vari ation with altitude to 4400 ft.) 42.5 in. hg., 2400 rpm (2100 hp) Take-off (two minutes): (Sea level) 51.5 in.hg., 2800 rpm (2500 hp) (Straight line manifold pressure vari ation with altitude to 3100 ft.) 51.0 in.hg., 2800 rpm (2500 hp). High impeller ratio 8.67:1 Maximum continuous: (9000 ft.) 42.5 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure vari ation with altitude to 16000 ft.) 41.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10800 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure vari ation with altitude to 15700 ft.) 43.5 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boots installed - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. A-763 8 (*Note: When airspeed instrument (0- 305 mph) is installed, the above-noted glide or dive speed should read 305 m ph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) With Speedpak and/or deicer boots inst alled - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. Usable ceilings See Approved Oper ating Manual (enroute climb curve). C.G. range See NOTE 1(b) for require d loading and gear retraction moment. Condition Weight Flap Landing Fwd. Limit Aft. Limit lbs. Position gear sta. %MAC sta. %Mac Take-off 107,000 Takeo ff Down 537.0 21.3 556.4 32.0 Climb or cruise 89,500 Takeoff Down 531.7 18.0 556.4 32.0 or less Straight line variation between above listed values. Climb or cruise 107,000 Up Up 533.5 19.0 559.9 34.0 89,500 Up Up 526.4 15.0 559.9 34.0 or less Straight line variation between above listed values. Landing 89,500 Down Down 531.7 18.0 556.4 32.0 o r l e s s Weight limits Landing: 89,500 lbs. Take-off: 107,000 lbs. (Dump valves are required) 3-engine ferrying: 80,000 lbs. See NOTE 11 for other conditions applicable. Minimum crew 3, Pilot and Copilot at +190 and Flight engineer at +226. Passengers Maximum 60 (CAR 4b.3812). See Appr oved Weight and Balance Report for actual number and location. Baggage See NOTE 4. Fuel capacity Tanks 2 and 3 (inboa rd) (790 gal. ea.) 9,480 lbs. (+563). Tanks 1 and 4 (middle) (1 ,555 gal. ea.) 18,660 lbs. (+558). Tanks 2a and 3a (outboard) (565 gal. ea.) 6,780 lb. (+560). See NOTE 5 regarding "System Fuel and Oil". Oil capacity With Item 1(b) or (f) propeller - 2 inboard tanks (56 gal. ea.) 840 lbs. (+455) 2 outboard tanks (56 gal. ea.) 840 lbs. (+474). With Item 1(d), (e) or (g) propeller - 2 inboard tanks (54 gal. ea.) 810 lbs. (+455). 2 outboard tanks (54 gal. ea.) 810 lbs. (+474). Control surface movements Main surfaces (booster pressure on) - Elevator 40° up 20° down Aileron 25° up 9° down Rudder 30° right 30° left Tabs (main surfaces in neutral) Elevator 22° up 12° down Aileron 12° up 12° down Rudder 25° right 25° left Flaps - 45° total angular travel. With Model 49 flaps installed in accordance with LAC Dwgs. 251010, 251011 and 273326, the flap movement is reduced to 41°. Serial Nos. eligible 2501 and up converted in acco rdance with Lockheed Service Bulletins 49/SB-500, - 500A and -545. Modifications covered by LAC 49/SB-500 were incorporated in serial Nos. 2589, 2590, 2601 and up, prior to delivery. Required equipment 1b, d, e (with 6801A-0 blades), f or g; 101(d); 108(b); 200(d) or (e); 201(f) or (g); 202(a), (b), (c) or (d); 203(e); 205(b), (c) or (d); 206(c) or (d); 209; 508; 600; 601. 9 A-763 VI - Model 649A-79, Approved December 20, 1949 (See NOTE 14 for interrelationship of models) Engines 4 Wright Cyclones 749 C18B D-1 with 16:7 reduction gear ratio. Fuel AN grade 100/130. Engine limits Low impeller ratio 6.46:1 Maximum continuous: (Sea level) 44.0 in.hg., 2400 rpm (2100 hp) (Straight line manifold pressure variation with altitude to 4400 ft.) 42.5 in. hg., 2400 rpm (2100 hp) Take-off (two minutes): (Sea level) 51.5 in.hg., 2800 rpm (2500 hp) (Straight line manifold pressure vari ation with altitude to 3100 ft.) 51.0 in.hg., 2800 rpm (2500 hp). High impeller ratio 8.67:1 Maximum continuous: (9000 ft.) 42.5 in.hg., 2400 rpm (1800 hp) (Straight line manifold pressure vari ation with altitude to 16000 ft.) 41.0 in.hg., 2400 rpm (1800 hp). Take-off (two minutes): (10800 ft.) 44.0 in.hg., 2600 rpm (1900 hp) (Straight line manifold pressure vari ation with altitude to 15700 ft.) 43.5 in.hg., 2600 rpm (1900 hp). Airspeed limits Level fli ght or climb - 271 mph (236 knots) for sea level to 16000 ft. Above 16000 ft. reduce speed 5 mph (4 knots) for each additional 1000 ft. of altitude. Flaps extended (Landing position) 146 mph (127 knots) (Approach position) 146 mph (127 knots) (Take-off position) 200 mph (174 knots) Landing gear extended or during gear operation - 175 mph (152 knots) Glide or dive Without Speedpak and/or deicer boots inst alled - 324 mph* (282 knots) for sea level to 13000 ft. Above 13000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude. (*Note: When airspeed inst rument (0-305 mph) is installed, the above-noted glide or dive speed should read 305 mph instead of 324 mph and the corresponding altitude should read 16000 ft. instead of 13000 ft.) With Speedpak and/or deicer boots installed - 300 mph (261 knots) for sea level to 17000 ft. Above 17000 ft. reduce speed 6 mph (5 knots) for each additional 1000 ft. of altitude.