Airworthiness Directive 95-12-02
one-timeAirworthiness Directives; Hiller Aircraft Corporation Model UH- 12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters
What this AD requires
This amendment adopts a new airworthiness directive (AD) that is applicable to Hiller Aircraft Corporation (Hiller) Model UH-12A, UH- 12B, UH- [[Page 30185]] 12C, UH-12D, and UH-12E helicopters. This action requires a dye-penetrant inspection of the head of the main rotor outboard tension-torsion (T-T) bar pin for cracks; a visual inspection of the outboard T-T bar pin for proper alignment, and an adjustment, if necessary; and, installation of shims at the inboard end of the drag strut. This amendment is prompted by two accidents involving failure of the outboard T-T bar pin on Hiller UH-12E helicopters. The actions specified by this AD are intended to prevent cracks in the head area of the outboard T-T bar pin, which could result in loss of in-plane stability of the main rotor blade and subsequent loss of control of the helicopter.
Which aircraft AD 95-12-02 applies to
Specific helicopter models are named in a preceding applicability provision not captured in the extracted text. AD addresses cracking of the main rotor outboard tension-torsion (T-T) bar pin, P/N 51452, per Hiller Aviation Service Letter 51-2 (dated March 31, 1978) and Service Bulletin 51-9 (dated April 8, 1983).
Whether AD 95-12-02 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.