AD 78-23-07

78-23-07 HILLER HELICOPTERS: Amendment 39-3344. Applies to Hiller Model UH-12D, UH-12E and UH-12E (4 Place) helicopters certificated in all categories, including Military Models UH-23D, OH-23G, H-23F and turbine-powered models, equipped with the finite life components listed below:

PART NO. NOMENCLATURE REPLACEMENT PERIOD APPLICABILITY 63192-7, -11 Snubber Assy., engine, longitudinal 4,650 hrs Note A 63192-5, -9 Snubber Assy., engine, lateral 4,650 hrs All 63197 Bracket, engine snubber 6,160 hrs All 63197-5 Bracket, engine snubber 9,850 hrs All 31197-3 Flyweight collective pitch ballast 2,500 hrs All 31318 Bellcrank, collective control 15,000 hrs Note B 31319-3 Tube, collective control 23,500 hrs Note B 31321 Shaft, dual collective control 10,400 hrs Note B 31344, -3, -5, or -9 Block Assy., collective stick 6,400 hrs Note B 31403 Arm Assy., collective and throttle controls 21,500 hrs E (4 place) 34141, -5 Scissor, cyclic control, lower 275 hrs All AN3-7A Attaching bolts, engine snubber (used to attach P/N 63197 bracket to deck and lord mount) 600 hrs All

Note A - All models except turbine-powered. Note B - All models except UH-12D and UH-23D.

To prevent failure of the above listed finite life components accomplish the following:

(a) Within fifty (50) hours time in service after the effective date of this AD, unless already accomplished, inspect the service history of each of the finite life components listed in this AD for adequacy of documentation.

NOTE: The finite life components may be documented by serial number, part nomenclature, part number or any combination.

(b) For those finite life components listed in this AD for which service history can be documented, no further action is required by this AD.

(c) For any finite life component listed in this AD for which service history cannot be documented:

(1) Prior to further flight, remove and replace those finitelife components whose replacement period is less than helicopter total time in service.

(2) Within five hundred (500) hours time in service from the effective date of this AD, remove and replace those components whose replacement period is greater than helicopter total time in service.

NOTE: The Criteria in (c), (1) and (2) applies to aircraft in service. Finite life criteria for aircraft submitted for original airworthiness certification are contained in AC-21-13.

(d) Only finite life components for which prior service history or representation as new can be documented may be used as replacement parts. Equivalent inspection procedures may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.

This amendment becomes effective December 14, 1978.