Textron Bell 412, Руководство по обслуживанию

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BHT-412-MM-2
5-00-00
Page 210
Rev. 23 15 DEC 2015 Export Classification C, ECCN EAR99
i. Hub and sleeve assembly
j. Main driveshaft
k. Mast
l. Transmission
4. When overtorque exceeds 104%, but does not exceed
112% (105 and 110% mast torque respectively for helicopters
S/N 36020 through 36999 and 37002 through 37999, and
helicopters modified by 412-570-001-103 or Post
BHT-412-SI-74 (412SP to 412HP Upgrade), do as follows:
a. Perform thorough visual inspection of components
listed in step 3.
b. Inspect main transmission chip detector(s).
c. Inspect main transmission internal filter or full flow
debris monitor (as applicable).
(1) If metal particles are found, indicating internal
failure, remove transmission for overhaul evaluation. Make an
entry in the component record explaining reason for removal
was overtorque. Remove all transmission system oil lines. Flush
and reinstall oil lines. Replace external oil filter element.
Remove and scrap oil cooler. Install new oil cooler.
(2) If chip detector(s) and internal filter or full flow
debris monitor (as applicable) appear normal and there is no
evidence of internal failure, return helicopter to service. Operate
normally for 3 to 10 hours and then check chip detector(s) and
internal filter or full flow debris monitor (as applicable). If no
metal particles are found, indicating internal failure, normal
scheduled inspection intervals may then be followed. If metal
particles are present prior to or at the 3 to 10-hour check or if
there is any evidence of internal failure, remove transmission for
overhaul evaluation. Make an entry in the component record
explaining reason for removal was overtorque. Remove all
transmission system oil lines. Flush and reinstall oil lines.
Replace external oil filter element. Remove and scrap oil cooler.
Install new oil cooler.
CONDITIONAL INSPECTIONS
5-40. AFTER OVERTORQUE (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER