2.84 MAIN TRANSMISSION OIL SYSTEM SERVIC-ING.
The transmission oil supply is in the sump case with the .ller port and dipstick gage (Figure 2-24), on the right rear of the main module. When .lling is required, oil is poured through the .ller tube on the main module case, and oil level is checked by a dipstick, marked FULL and ADD,or FULL COLD and ADD on one side of the dipstick and FULL HOT and ADD on the other side. Check oil level as follows:
NOTE

Remove the dipstick, clean and reinsert to obtain correct reading.
a. Single scale dipstick is for checking cold oil levels. Wait at least 2 hours after shutdown to check oil. If oil level must be checked when hot (immediately to 1/2 hour after shutdown), oil level will read about 1/2 inch low (halfway between full and add mark or 1/2 inch below add mark).
b. Dual scale dipstick is for checking cold or hot oil levels. Use appropriate scale when checking oil level. Read hot side of dipstick when checking hot oil (immediately to 1/2 hour after shutdown), or cold side of dipstick when checking cold oil (at least 2 hours after shutdown).
2.85 TAIL AND INTERMEDIATE GEAR BOX SER-VICING.
The intermediate gear box oil level sight gage (Figure 2-24) is on the left side of the gear box. The tail gear box oil level sight gauge is on the right side.
2.86 PARKING.
The methods used to secure the helicopter for temporary periods of time will vary with the local commands. The minimum requirements for parking are: gust lock engaged and wheel brakes set, tailwheel locked, and wheels properly chocked. For extended periods of time, engine inlet covers, exhaust covers, and pitot covers should be installed, and stabilator slewed to 0°. When required, the ignition system and the doors and window should be locked.
2.87 PROTECTIVE COVERS AND PLUGS.
The covers and plugs (Figure 2-24) protect vital areas from grit, snow, and water. The protected areas are avionics compartment air inlet, engine air inlet/accessory bay, engine and APU exhausts, pitot tubes, IRCM transmitter and APU air inlet and main transmission oil cooler exhaust. Covers and plugs should be installed whenever the helicop-ter is to be on the ground for an extended period of time. Each cover may be installed independently of the others.
2.88 MOORING.
Mooring .ttings are installed at four points on the heli-copter (Figure 2-25). Two .ttings are at the front of the fuselage, one above each main landing gear strut, and two at the rear, one attached to each side of the aft transition section. These .ttings are used to tie down the helicopter when parked, and wind conditions require it.
2.88.1 Mooring Instructions. Refer to TM 1-1500-250-23 for mooring instructions.
2.88.2 Main Rotor Tiedown. Tiedown of the main rotor should be done when the helicopter will be parked for a period of time or when actual or projected wind condi-tions are 45 knots and above. To tiedown main rotor blades, do this:
1.
Turn rotor head and position a blade over cen-terline of helicopter. Install tiedown .tting into receiver while pulling down on lock release cable. Release cable when .tting is installed in blade receiver.

2.
Uncoil tiedown rope.

3.
Repeat steps 1. and 2. for each remaining blade.

4.
Turn blade to about 45° angle to centerline of helicopter and engage gust lock.

Do not de.ect main rotor blade tips more than 6 inches below normal droop posi-tion when attaching tiedowns. Do not tie down below normal droop position.
5. Attach tiedown ropes to helicopter as shown in Figure 2-25. To release tiedown .tting, pull down on lock release cable and remove .tting from blade.

TIEDOWN LINE (LEFT AND RIGHT SIDE)
AA0522A
SA

CHAPTER 3

AVIONICS

Section I GENERAL
3.1 DESCRIPTION.
The avionics subsystem consist of the communications equipment providing VHF-AM, VHF-FM, and UHF-AM communications. The navigation equipment includes LF-ADF, VOR, ILS, marker beacon, TACAN, and Doppler/ GPS. VHF-FM homing is provided through the No. 1 VHF-FM communication radio. Control of the majority of the navigation and communication radios is provided by the Avionics Management System (AMS). Transponder equip-ment consists of a receiver-transmitter with inputs from barometric altimeter for altitude .xing. Absolute height is provided by a radar altimeter. Each antenna will be de-scribed with its major end item, and locations as shown in Figure 3-1.
　
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