| AD Number | 78-18-03 | Status | Active |
| Effective Date | October 06, 1978 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-3291 |
| Product Type | ["Aircraft"] | Product Subtype | ["Rotorcraft"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Hiller Aviation Siam Hiller Holdings, Inc. |
| Model(s) | UH-12D UH-12E |
78-18-03 HILLER AVIATION: Amendment 39-3291. Applies to Model UH-12D and UH-12E helicopters which have been converted to turbine power in accordance with Soloy Conversions, Limited, STC Nos. SH177WE and SH178WE respectively, certificated in all categories. Compliance required as indicated unless already accomplished.
To reduce the possibility of drive shaft failure due to internal corrosion and subsequent helicopter structural and control system damage, accomplish the following:
A. Within the next 600 hours time in service, or 6 months calendar time, whichever occurs first after the effective date of this AD, perform the inspection and modifications and/or replacements, as appropriate, of the Soloy P/N 560-2408 shaft in accordance with Soloy Conversions, Limited Service Bulletin 05-560 dated May 19, 1978, or later FAA approved revisions.
B. Equivalent methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).
All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., Post Office Box 60, Chehalis, Washington 98532. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.
This amendment becomes effective October 6, 1978.