B-17 Pilots Manual.pdf

,';.~,..--2. OPERATIONAL EQUIPMENT~. CENTRAL CONTROL PANEL AND PEDESTAL.(1) WING FLAP AND LANDING GEAR CON-TROLS. - The wing flap motor is controlled by atoggle switch. The time required to lower the flapsat 147 mph is between 15 and 30 seconds.WARNINGIn returning the flap control switches from"DOWN" to "OFF," be sure the toggle switchis not allowed to snap to "UP," resulting inimmediate retraction of the flaps.(2) The main landing wheels and tail wheel areoperated simultaneously by a toggle switch. A hingedguard prevents accidental moving of the switch to the"Up" position. Warning that the landing gear is notfully extended is given by a green indicator lamp failingto light, and by a horn which sounds if any throttleis closed.(3) COWL FLAP VALVES. - Cowl flaps are operatedby four valves, each valve controlling the flapson one nacelle. The valve must be turned to "LOCKED"when the desired position of the' flaps is reached.Slight "cracking" of the control valve will result inrelatively slow travel of the flaps when close adjustmentis desired.(4) FUEL BOOST CONTROLS. - The fuel boostpumps, operated by four toggle switches, provide fuel@KEY TO FIGURE21I. IG"ITION SWITCHES2. FUELBOOST PUMPSWITCHES3. FUEL SHUT-OFFVALVESWITCHES~. COWLFLAP CONTROLVALVES5. LANDINGGEARSWITCH6. WINGFLAP SWITCH8. TURROA"D MIXTURECONTROLLOCK9. THROTTLE CONTROLLOCK10. PROPELLERPITCHCONTROLSII. PROPELLERPITCHCONTROL LOCK12. THROTTLE CONTROLS7. TURBOSUPERCHARGER13. MIXTURECONTROLSCONTROLSFigure 21 - Control Panel and Pedestalpressure for starting engines and for maximum power,and also prevent vaporization in the lines to enginedrivenpumps due to hot fuel or high altitudes. Booster.pressure at the No.3 nacelle fuel strainer also suppliesfuel to the priming system.16