81-10-02
final ruleAirworthiness Directive; HILLER AVIATION Models FH 1100 Series Helicopter
Unsafe Condition: The upper controls support column may contact and damage the main rotor mast due to an undersized base flange (P/N 24-30210) with thickness less than 0.080 inches (0.090 ± 0.010 inches specification).
Why matched: Airworthiness Directive; HILLER AVIATION Models FH 1100 Series Helicopter