Textron Bell 412, Maintenance Manual

Page: 286 / 288

BHT-412-MM-2
5-00-00
Page 236
Rev. 26 01 JUN 2018 Export Classification C, ECCN EAR99
POWER PLANT (CONT)
Starter Generator 209-060-221-001 1000 hours
Starter Generator 200SG119Q 1000 hours
Fire Extinguisher Container 209-062-908-001 5 years
Table 5-1. Component Overhaul Schedule (Cont)
NOTES:
Operating time specified for overhaul of any given part number in this schedule applies to all
successive dash numbers (or suffixes), unless otherwise specified.
On condition. Special Inspection required each 2500 hours ( paragraph 5-28 and paragraph 5-29 ).
The overhaul interval for engine combining (reduction) gearboxes modified in accordance with
TB 412-89-80 is 4000 hours.
Special Inspection required each 2500 hours on helicopters S/N 36020 through 36999 and helicopters
modified by 412-570-001-103 or Post BHT-412-SI-74 (412SP to 412HP Upgrade) (
paragraph 5-30 ).
Refer to .
All transmission quills, with the exception of rotor brake quill, shall be overhauled at time of
transmission overhaul.
Incorporation of Increased Maximum Continuous Power Kit (BHT-412-SI-38) P/N 412-706-029-ALL
reduces the time between overhaul (TBO) interval to 2500 hours.
Mast assembly 412-040-366-109 is not field serviceable. It must be returned to Bell Helicopter Textron
for any maintenance requiring disassembly.
For each hoist operation performed within penalty CG region, 4 additional flight hours must be logged
against main rotor mast, yoke, and lower cone seat. Refer to Chapter 4 for penalty region chart.
The following items are to be overhauled at the same time as the tail rotor hub assembly:
Idler assembly 209-011-711-ALL
Lever assembly 209-011-712-ALL
Nut, tail rotor retention 212-010-706-ALL
Crosshead 212-010-775-ALL
Link assembly 209-011-713-ALL
Hydrostatic test in accordance with specification DOT-4 DA, DOT-4 DS700, or DOT-SP-7945, as
marked on the reservoir, every 5 years or prior to refill after leakage or discharge. Extensions to this
item are not permitted.
Table 5-1. Component Overhaul Schedule (Cont)
NOMENCLATURE PART NUMBER OVERHAUL INTERVAL (HOURS)
1
11
1
2
3
4
5 19
6
7
8
9
10
11