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2.42.1 Transmission Oil Temperature Indicator.
The transmission oil temperature indicator marked XMSN TEMP is a part of the central display unit (Figure 2-8). Refer to Chapter 5 for limitations. Power to operate the temperature indicator and MAIN XMSN OIL TEMP cau-tion legend is provided from the No. 1 and No. 2 ac pri-mary buses through the signal data converters and the No. 2 dc primary bus through a circuit breaker, marked MAIN XMSN.
2.42.2 Transmission Oil Pressure Indicator. The transmission oil pressure indicator, marked XMSN PRESS, is a part of the central display unit (Figure 2-8). Refer to
Change 2 2-43

Chapter 5 for limitations. Power to operate the pressure indicator and MAIN XMSN OIL PRES caution legend is provided from the No. 1 and No. 2 ac primary buses through the signal data converter and No. 2 dc primary bus through a circuit breaker marked MAIN XMSN.
2.42.3 Transmission Chip Detector System. The transmission chip detector system consists of chip detectors on the left and right input modules, left and right accessory modules, the main gear box module, and caution legends marked CHIP INPUT MDL-LH, CHIP INPUT MDL-RH, CHIP ACCESS MDL-LH, CHIP ACCESS MDL-RH and CHIP MAIN MDL SUMP. These detec-tors provide warning of chips in any of .ve areas of the main transmission system. Each chip detector incorporates a self-sealing provision so that it can be removed for visual inspection without loss of oil. The magnetic plugs on each chip detector attract ferrous particles at any of the detector locations. The fuzz burn-off feature prevents false warnings by burning off small chips and fuzz. The fuzz burn-off fea-ture is deactivated when oil temperature reaches 140°C. Deactivation of the fuzz burn-off feature does not disable detection and illumination of caution lights. The main transmission chip detector is also connected to a 30 second time delay relay to allow small chips and fuzz to burn off and/or wash away. Chips that are too large to burn off or wash away trigger the detection system which illuminates a caution light on the caution/advisory panel. The pilot or maintenance personnel must check the caution/advisory panel before removing power to determine the location of the chip. The system is powered by the dc essential bus through a circuit breaker on the upper console circuit breaker panel marked CHIP DET.
2.42.4 Deleted.
2.43 TAIL DRIVE SYSTEM.
Six sections of drive shaft connect the main module to the tail rotor gear box. The shafts drive the oil cooler blower and transmit torque to the tail rotor. Each shaft is dynami-cally balanced tubular aluminum. Multiple disc (.exible) couplings between sections eliminate universal joints. The shafts are ballistically tolerant if hit by a projectile and are suspended at four points in viscous-damped bearings mounted in adjustable plates and bolted to fuselage support brackets.
2.43.1 Intermediate Gear Box. Mounted at the base of the pylon is the oil-lubricated intermediate gear box (Figure 2-1). It transmits torque and reduces shaft speed from the main gear box to the tail gear box. The intermediate gear box may run at cruise .ight for 30 minutes, with loss of all oil. An internal metal fuzz suppression chip/temperature sensor detects metal particles and gear box overtemperature conditions, to light caution legends marked CHIP INT XMSN and INT XMSN OIL TEMP.
2.43.2 Tail Gear Box. The oil-lubricated tail gear box (Figure 2-1) at the top of the tail pylon transmits torque to the tail rotor head. The gear box mounts the tail rotor, changes angle of drive and gives a gear reduction. It also enables pitch changes of the tail rotor blades through the .ight control system. The gear box housing is magnesium. The tail gear box may run at cruise .ight for 30 minutes with loss of all oil. An internal fuzz suppression metal chip/ temperature sensor detects metal particles, and gear box overtemperature conditions, to light caution legends, marked CHIP TAIL XMSN and TAIL XMSN OIL TEMP.
2.43.3 Intermediate and Tail Gear Box Chip/ Temperature Systems. The intermediate and tail gear boxes contain identical chip/temperature sensors that indi-cate in the cockpit when the gear box temperature is too high, or a chip is present. The chip detectors incorporate a fuzz burn-off feature which eliminates false warning due to fuzz and small particles. When a chip is detected and will not burn off, a caution legend on the caution/advisory dis-play will go on, indicating CHIP INT XMSN or CHIP TAIL XMSN. The oil temperature sensor is a bimetal strip that reacts to temperatures. When the oil temperature reaches 140°C a switch closes to turn on a caution legend in the cockpit, marked INT XMSN OIL TEMP or TAIL XMSN OIL TEMP. Power to operate the oil temperature system is from the No. 2 dc primary bus through a circuit breaker marked MAIN XMSN.
　
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