BHT-412-MM-2
5-00-00
Page 110 Rev. 16 26 FEB 2013
Export Classification C, ECCN EAR99
A-4282, A-4288, A-4289, A-4290, A-4303, A-4319,
A-4320, A-4325, A-4327, A-4328, A-4329, A-4332,
A-4333, A-4334, A-4335, A-4336, A-4337, A-4358,
A-4366, A-4368, A-4369, A-4370, A-4371, A-4372,
A-4374, A-4376, A-4377, A-4378, A-4379, A-4380,
A-4383, A-4385, A-4386, A-4387, A-4394, A-4395,
A-4397, A-4400, A-4401, A-4403, A-4411, A-4417,
A-4418, A-4428.
Spiral bevel gears with the suffix R after the serial
number are acceptable for service.
Transmissions/helicopters delivered with an affected serial
numbered spiral bevel gear 204-040-701-103
Bevel Gear: A-3843, A-3863, A-3870, A-3876, A-3898,
A-3900, A-4026, A-4037, A-4229, A-4231
Transmission: A-114, A-122, A-124, A-125, A-127, A-128,
A-129, A-132, A-133, A-140
Model 412: 33175, 33177, 33178, 33179, 33181, 33182,
33185, 33186, SPARE, 33192
Chapter 63
BHT-412-CR&O
1. Remove and inspect transmission internal sump filter for
metal contamination. If metal contamination is evident, notify
Product Support Engineering of spiral bevel gear serial
number, hours, and type contamination.
2. Every 50 hours (until 250 hours), visually inspect spiral
bevel gear.
a. Remove quill pad cover (204-040-174-001) or rotor
brake quill (if installed) from transmission.
b. Utilizing the port opening in the main gear case and a
bright light and mirror, inspect all 62 teeth in spiral bevel gear
204-040-701-103. Carefully inspect each tooth for evidence of
chipping or loss of material (Figure 5-7).
5-14. DAILY/10 HOUR INSPECTION, WHICHEVER OCCURS FIRST UNTIL 250 HOURS (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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