4-20 Additional Limitations
4-21 Parts with a Recommended Time Between Overhauls (TBO)
Remove the following components for overhaul when they have accumulated 2000 hours
time in service since new or since last overhaul. Maintenance procedures are listed for
reference and are subject to revision.
Part Number Description Reference
C005-13 Main Rotor Blade & Spindle Assembly
MM § 62-10 & IPC Figure 62-1
F006-1 Main Rotor Gearbox Assembly
MM § 63-20 & IPC Figure 63-3
C017-6 Swashplate Assembly
MM § 67-40 & IPC Figure 62-5
F018-1 Clutch Assembly
MM § 63-12 & IPC Figure 63-1
C021-1 Tail Rotor Gearbox Assembly
MM § 65-40 & IPC Figure 65-9
C031-1 Tail Rotor Pitch Control Assembly
MM § 67-62 & IPC Figure 65-9
C649-4 Oil Cooler
MM § 79-30 & IPC Figure 63-15
D211-3 Hydraulic Reservoir Assembly
MM § 67-52 & IPC Figure 67-25
D212-5, -6 Hydraulic Servo Assembly
MM § 67-53 & IPC Figures 67-29 & 67-33
D500-2, -3 Pump Assembly
MM § 67-51 & IPC Figure 63-3
F649-1 Oil Cooler
MM § 79-30 & IPC Figure 79-7
F792-1 Dual Tachometer
MM § 95-23 & IPC Figure 95-1
4-22 Parts with a Recommended Replacement Time
Remove the following components when they have accumulated 2000 hours time in service
since new. Maintenance procedures are listed for reference and are subject to revision.
Part Number Description Reference
A120-5 Bellcrank
MM § 67-75 & IPC Figure 65-9
A215-015 O-Ring
MM § 28-11 & IPC Figure 28-1
A522-10 Control Cable
MM § 76-12 & IPC Figure 76-1
A522-11 Control Cable
MM § 28-31 & IPC Figure 28-9
A522-14 Control Cable
MM § 21-31 & IPC Figure 21-31
A729-68 Tube
MM § 71-30 & IPC Figure 71-13
A785-37 Hose
MM § 71-10 & IPC Figure 75-1
A785-38 Hose
MM § 71-41 & IPC Figure 71-15
A918-5 Elastic Cord
MM § 5-43 & IPC Figure 67-41
A947-2 Plate Assembly
MM § 63-10 & IPC Figure 63-1
B173-5 V-Belt
MM § 21-21 & IPC Figure 21-3
B277-12 Clamp
MM § 21-30 & IPC Figure 21-33
B345-4 Pitch Link
MM §§ 64-10 & 67-62 & IPC Figure 64-1
C119-2 Bumper
MM § 64-10 & IPC Figure 64-1
C152-1 Thrust Washer
MM §§ 62-10 & 62-20 & IPC Figure 62-3
C189-14 Nut
MM §§ 62-10 & 62-20 & IPC Figure 62-3
C522-10 Control Cable
MM § 76-11 & IPC Figure 76-1
MAY 2015 Chapter 4 Airworthiness Limitations Page 4.3
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