SOURCE PRIMARY/STANDARD ALTERNATE FUELS FUEL
NOTE
Commercial fuels are commonly made to conform to American Society for Testing and Materials (ASTM) Speci.cation D 1655. The ASTM fuel speci.cation does not contain anti-icing additives unless speci.ed. Icing inhibitor conforming to MIL-I-85470 or MIL-I-27686 (Commercial name PRIST) shall be added to commer-cial and NATO fuels, not containing an icing inhibitor, during refueling operations, regardless of ambient tem-peratures. Icing inhibitor conforming to MIL-I-85470 is replacing the MIL-I-27686 version. The use of MIL-I-27686 icing inhibitor is acceptable until all supplies are depleted. Adding PRIST during refueling operation shall be done using accepted commercial mixing procedures. The additive provides anti-icing protection and also functions as a biocide to kill microbial growths in heli-copter fuel systems.
2.81 APU OIL SYSTEM SERVICING.
NOTE
Do not service the APU with DOD-L-85734 oil. If DOD-L-85734 oil is inadvertently added to the APU, drain the oil and add MIL-L-7808 or MIL-L-23699 oil. Flushing the system before re.lling is not required.
a.
The APU oil supply is in the APU gear box assem-bly. The sump .ller/oil dipstick port (T-62T-40-1) or cap and .ll to spill plug (GTC-P36-150) (Figure 2-24) are on the left side of the gear box housing.
b.
When the APU is cool to the touch the COLD side of the dipstick may be used, if the APU is hot to the touch the HOT side of the dipstick may be used.
2.82 HANDPUMP RESERVOIR SERVICING.
Do not allow reservoir level to fall below re.ll line.
Servicing of the re.ll handpump is done when .uid level decreases to the re.ll line on the .uid level sight gage, on the side of the pump tank. When .uid level decreases to the re.ll line, 1 quart of hydraulic .uid can be poured into the reservoir after removing the re.ll cap. Handpump reservoir level should be replenished only in 1 quart units.
2.83 HYDRAULIC SYSTEMS SERVICING.
Reservoirs (Figure 2-24) for the hydraulic systems are on the hydraulic pump modules. Fluid level sight gages are visible on the side of each pump. All hydraulic pump res-ervoir capacities are 1 U. S. quart to the blue (black on some pumps) mark. When the indicator reaches the red area (re.ll) point, 2/3 of a pint is required to return the indicator to the green mark. The .uid level indication is the 1/8 inch wide gold band at the outboard edge of the level piston. To re.ll the reservoirs, the .uid is supplied from the manual handpump. After .ight, .uid in hydraulic systems will be hot. Piston movement of up to 3/8 inch into the blue (black on some pumps) (over.ll) zone is acceptable. When piston is beyond this limit, bleed off enough .uid to bring piston back to 3/8 inch above .ll limit. To replenish the pump reservoir .uid, do the following:
1. Unscrew handpump lid and pour in clean hy-draulic .uid, MIL-H-83282, until pump is full. Make sure you can always see oil in pump res-ervoir window while servicing, so not to pump air into pump module’s reservoir. Keep .lling.
Change 3 2-83
2.
Make sure pump cover is clean, then screw lid on tight.
3.
Turn selector valve to desired reservoir to be .lled. OUT 1 is left pump module, OUT 2 is right pump module, and OUT 3 is backup pump module.
4.
While holding selector valve handle down, crank pump handle on handpump clockwise and .ll desired hydraulic pump module until forward end of piston in reservoir window is at forward end of green decal on reservoir hous-ing.
5.
Check that reservoirs stay full (forward end of piston at forward end of green decal), with .uid at ambient temperature 1 hour after .ight.
6.
Make sure area remains clean during procedure.
7.
Stow selector valve handle in OUT 4 (capped off) position.
8.
Turn on electrical power.
9.
Check caution panel for #1 RSVR LOW, #2 RSVR LOW, and BACK-UP RSVR LOW lights are off.
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