AD 2013-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Eurocopter Deutschland (Eurocopter) Helicopters |
Unsafe Condition
Separation of the air conditioning drive pulley from the rotor brake disc on the tail rotor driveshaft, which could damage the T/R driveshaft and result in loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Before further flight, inspect the pulley for looseness and proper lockwire installation. Thereafter, inspect the pulley every 10 hours time-in-service (TIS) for looseness and proper lockwire. Within 25 hours TIS, remove the pulley, inspect bolts and mounting holes with a 10X or higher magnifying glass, and reinstall the pulley. Replace the pulley if damage or distortion is found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight, and at intervals not exceeding 10 hours TIS for repetitive inspections; within 25 hours TIS for removal, inspection, and reinstallation of the pulley.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter Model MBB-BK117 A-3, MBB-BK117 A-4, MBB-BK117 B-1, and MBB-BK117 C-2 helicopters with a Metro Aviation vapor-cycle air conditioning kit installed in accordance with Supplemental Type Certificate No. SH3880SW.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.