AD 84-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Columbia Helicopters, Inc. | 234 | Airworthiness Directives; BOEING VERTOL COMPANY Model 234 Helicopters |
Unsafe Condition
Bypassing of the lower boost dual actuating cylinder(s) and fatigue failures of NAS 1351-3H10P cap screws on lower boost dual actuating cylinders in the flight control system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Flight Manual by inserting Revision 13 dated May 9, 1984. Inspect hydraulic system fluid contamination levels and flush if necessary. Inspect shutoff valve spools for staining or pitting and replace parts as needed. Replace NAS 1351-3H1OP cap screws with zero time screws. Conduct inspections, jam indicator button checks, leakage checks, and safety wire replacement per specified telex. Compliance times may be adjusted with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time in service after the effective date of this AD, unless already accomplished. Subsequent actions at intervals not to exceed specified times (e.g., 300 hours for contamination inspections, 600 hours for cap screw replacement).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
BOEING VERTOL COMPANY Model 234 helicopters certified in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.