| AD Number | 77-09-07 | Status | Active |
| Effective Date | May 19, 1977 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-2890 |
| Product Type | ["Propeller"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Dowty Propellers |
| Model(s) | (c) R175/4-30-4/ (c) R212/4-30-4/ |
77-09-07 DOWTY ROTOL: Amendment 39-2890. Applies to Dowty Rotol Type (c)R175/4-30-4/13E and (c)R212/4-30-4/22 propellers having hub and driving center, P/N 601023166, 601023223, or 601023227 modified to Dowty Rotol Mod. No. (c)VP2381 standard. These propellers are installed on, but not necessarily limited to, Fokker Model F-27 Mks. 100, 300, and 700 Series and Hawker Siddeley Model 748 Series 2A airplanes.
Compliance is required at the next propeller overhaul or within the next 4700 hours propeller time in service after the effective date of this AD, whichever occurs first, unless already accomplished.
To prevent cracking and possible failure of the hub driving center due to improper machining, accomplish the following:
(a) For Type (c)R175/4-30-4/13E propellers, that incorporate the following hub and driving center assemblies, rework the hub driving center to salvage scheme No. 640144020 in accordance with Paragraph 2A of Dowty Rotol Service Bulletin 61-857, datedFebruary 3, 1975, or an equivalent approved in accordance with Paragraph (c) of this AD:
Hub and Driving Center Assembly Serial Numbers
175/58/67
175/58/72
175/58/91
175/58/146
175/59/184
(b) For Type (c)R175/4-30-4/13E propellers that incorporate hub and driving center assemblies having serial numbers not listed in paragraph (a) of this AD and Type (c)R212/4-30- 4/22 propellers -
(1) Inspect the hub driving center to verify correct machining in accordance with Paragraph 2B of Dowty Rotol Service Bulletin 61-857 dated February 3, 1975, or an equivalent approved in accordance with paragraph (c) of this AD; and
(2) If the hub driving center is found to have been incorrectly machined, rework it to salvage scheme No. 640144020 in accordance with Paragraph 2A of Dowty Rotol Service Bulletin 61-857, dated February 3, 1975, or an equivalent approved in accordance with paragraph (c) of this AD.
(c) The equivalent means of compliance specified inparagraphs (a) and (b) of this AD must be approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region c/o American Embassy, APO New York, N.Y. 09667.
This amendment becomes effective May 19, 1977.