Bell 206L4 Maintenance Manual page 31

TC APPROVED
NOTES (CONT):
Selected serial numbers of tail rotor blade 206-016-201-127 will have been returned to Bell Helicopter
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Textron (BHT) for evaluation no later than 30 September 1990. Affected blades inspected at BHT and
found to be acceptable have the suffix "M" added to the serial number. Refer to ASB 206L-90-71 Rev. A,
dated 31October 1990 for list of serial numbers affected.
Selected serial numbers of main rotor latch bolt 206-011-260-101 must be removed from service. Refer
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to ASB 206L-92-86, dated 3 December 1992 for list of serial numbers affected
Landing gear crosstubes 206-053-109-ALL and 206-053-119-ALL (all dash numbers) will have been
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removed from service no later than 30 September 1994. Refer to ASB 206L-94-93, dated 11 April 1994.
Reserved.
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Reserved.
20
Each component with a retirement life sensitive to torque events will be assigned a maximum
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Retirement Index Number (RIN). This RIN corresponds to maximum allowed fatigue damage resulting
from lifts and takeoffs. A torque event is defined as a takeoff (one takeoff plus subsequent landing = one
RIN) or a lift (internal or external). For example, if an operator performs six takeoffs and 10 slingloads,
this would total 16 torque events;
(6 takeoffs = 6 events, 10 slingloads = 10 events, 6 + 10 = 16 torque events total).
Pilots are to record total number of torque events for each flight. This allows maintenance personnel to
convert torque events to RIN by applying the appropriate RIN adjustment factor. Refer to
ASB 206L-94-99 Rev. B, dated 10 August 2001. A new component will begin with an accumulated RIN
of zero, that will be increased as lifts and takeoffs are performed. Operator will record number of lifts and
takeoffs (torque events), and increase accumulated RIN accordingly. When maximum RIN is reached or
retirement flight hours, whichever occurs first, component will be removed from service.
The retirement life of trunnion 206-011-120-103/-105 is based solely on RIN. Retire trunnion when RIN
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= 24,000. For each takeoff/lift, add one RIN if the trunnion is installed on 206L, 206L1, or 206L3
(includes 206L3 with Increase Power Operation kit installed per BHT-206-SI-2039) and two RIN if the
trunnion is installed on a 206L4. Refer to ASB 206L-94-99 Rev. B, dated 10 August 2001.
Retire main rotor masts 206-040-535-001/-005/-101/-105/-109 when RIN = 44,000. For each takeoff/lift,
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add one RIN if the mast is installed on 206L, 206L1, or 206L3 (includes 206L3 with Increase Power
Operation kit installed per BHT-206-SI-2039) and two RIN if the mast is installed on a 206L4. Refer to
ASB 206L-94-99 Rev. B, dated 10 August 2001.
Collective idler link 206-010-446-105, serial numbers A-1 through A-27, inclusively, and serial numbers
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RE-238 through and including RE-270 will be retired from service at 1200 hours service time. Refer to
ASB 206L-98-110, dated 6 May 1998.
Collective lever 206-010-447-105, serial numbers A-1 through A-22, inclusively, will be retired from
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service at 1200 hours service time. Refer to ASB 206L-98-110, dated 6 May 1998.
Reserved.
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Export Classification C, ECCN EAR99
Table 4-1. Airworthiness Limitations Schedule (Cont)
BHT-206L4-MM-1
25 JUN 2019 Rev. 23
4-00-00
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