Textron Bell 412, Maintenance Manual

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BHT-412-MM-2
5-00-00
Page 178
Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99
Chapter 63 3. After input gear quill has been assembled into main case,
install rotor brake quill in transmission.
Chapter 63
BHT-412-CR&O 4. Visually inspect outside of transmission for evidence of
corrosion, damage, and oil leaks (including leaking at seals at
input, mast, tail rotor output, and accessory quills) before
disassembling transmission.
5. Drain and strain transmission lubricant. Bag any foreign
material found and deliver with transmission for evaluation
during this inspection.
6. Remove mast chip detector from top case, planetary
detector from main case, full flow detector from sump case, and
chip detector from bottom of sump case. Visually inspect
detectors for cut packings, burrs, bent tubes, and foreign
material. Clean detectors as required with MEK (C-309).
7. Any foreign material found on detectors or in lubricant shall
be evaluated. Inspection may require additional investigation to
identify course(s) of foreign material and initiate appropriate
action.
BHT-412-CR&O 8. Disassemble main transmission to accomplish the
following:
a. Remove and inspect the following jet assemblies from
transmission and check for evidence of clogging.
(1) 204-040-262 – Jet No. 2
(2) 204-040-326 – Jet No. 3
(3) 204-040-288 – Jet No. 5
(4) 204-040-135 (2 each) — Jet located in ring gear
case
b. Remove top case. Inspect mast assembly mating
surface, ring gear mating surface, and pilot diameters for fretting
and wear.
SPECIAL INSPECTIONS
5-34. EACH 3000 HOURS OF TRANSMISSION (412-040-004) OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER