Quantcast Refueling of External Auxiliary Tanks

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TM 1-1520-238-10 2-88 Change 8 WARNING When opening anti-syphoning device on external tank flapper valve, extreme care should be exercised when releasing air pressure to preclude venting of fuel overboard through filler neck. NOTE Use of JP–4 is prohibited during auxiliary tank operation above 80 F ambient. External fuel transfer is prohibited below minimum safe single engine airspeed. Internal fuel transfer is prohibited during external fuel transfer. i. Refueling of External Auxiliary Tanks. The ex- ternal auxiliary tanks are gravity-filled through filler recep- tacles. Remove the gravity filler caps and service the aux- iliary tanks to the ”AH–64 Fill line” marked on the flapper valve inlet to the tank. j. Fuel Sump Drains. Two fuel sump drains (detail K, fig 2-45), one for each tank, are located on the under- side of the fuselage. They are used to drain fuel and check for fuel contamination. To actuate, press the plunger. Hold until sufficient fuel has been drained. The auxiliary fuel tanks also contain fuel drains. To actuate the auxiliary fuel tank drain valve, insert a phillips head screwdriver, push inward while twisting clockwise until sufficient fuel has been drained. Then reverse to stop fuel flow. 2.54.3 Oil System Servicing. a. Oil Types. Oils are classified as primary, com- mercial equivalent, or emergency. Commercial equivalent oils are listed in table 2-9. There are no emergency oils authorized. b. Nose Gearbox Servicing. The nose gearboxes are mounted on the front of each engine. When the oil falls below the proper level (fig 2-45), service with oil (table 2-7). c. Main Transmission Servicing. Access to the oil filler cap and the right sump oil level sight gage are through the transmission access panel on the right side of the fuselage (fig 2-2). The left sump oil level sight gage can be viewed through the transmission access door on the left side of the fuselage (fig 2-2). When the oil falls be- low the proper level, either side, (fig 2-45), service with oil (table 2-7). CAUTION Before beginning an extended flight with auxiliary fuel tanks installed, engine oil tanks will be filled to the ‘‘FULL” point on the sight glass. d. Engine Servicing. The engine oil tank is located in the engine frame. It is serviced through a gravity filler port. An oil level sight gage is located near the gravity filler port. When the oil falls below the proper level (fig 2-45), service with oil (table 2-7). e. APU Servicing. The APU oil filler cap and oil lev- el sight gage are located on the oil reservoir on the APU gearbox. The sight gage can be viewed through an ac- cess panel under the No. 2 engine. When the oil falls be- low the proper level (fig 2-45), service with oil (table 2-7). f. Hydraulic System Servicing. The hydraulic system should only be serviced (fig 2-45) with approved fluids from table 2-7. Detailed hydraulic system servicing instructions are in TM 1-1520-238-23.



 


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