| AD Number | 77-16-02 | Status | Active |
| Effective Date | August 31, 1977 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-2995 |
| 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) R.209/4-40-4.5 (c) R.245/4-40-4.5 (c) R.259/4-40-4.5 |
77-16-02 DOWTY ROTOL: Amendment 39-2995. Applies to Dowty Rotol propeller types R245/4-40-4.5/13, R259/4-40-4.5/17 installed on but not necessarily limited to Convair 600 series airplanes and R209/4-40-4.5/2 installed on but not necessarily limited to Nihon YS-11 and 11A airplanes, except those propellers incorporating modification VP 2869 contained in Dowty Rotol Service Bulletin 61-875, Rev. 1 dated October 20, 1976.
Compliance is required as indicated.
To prevent pitch lock piston cracking and subsequent inability to feather the propeller, accomplish the following:
(a) For propeller pitch lock pistons with 19,000 or more flights on the effective date of this AD, before further flight, comply with paragraph (d) of this AD.
(b) For propeller pitch lock pistons with less than 19,000 flights on the effective date of this AD, comply with paragraph (c) of this AD.
(c) For propeller pitch lock pistons, P/N RA 70089:
(1) Prior to the accumulation of 15,000 flights or within the next 100 flights, whichever occurs later, unless already accomplished within the last 900 flights, unless otherwise required by paragraph (e) of this AD, and thereafter at intervals not to exceed 1,000 flights from the last inspection until reaching 19,000 flights, inspect the pitch lock piston for cracks around the outside diameter at the location of the 0.025 inch radius in accordance with the procedures and instructions in Dowty Rotol Service Bulletin 61-873, Revision 1, dated October 20, 1976, or an FAA-approved equivalent.
(2) If a crack is found during an inspection required by paragraph (c)(1), before further flight, comply with paragraph (d) of this AD.
(d) Replace the pitch lock piston with either -
(1) A new zero time part, P/N RA 70089, in accordance with Dowty Rotol Service Bulletin 61-873, Revision 1, dated October 20, 1976, or an FAA-approved equivalent, and thereafter comply with paragraphs (c), (d), and (e) of this AD; or
(2) A new redesigned pitch lock piston and cylinder cover bush in accordance with Dowty Rotol Service Bulletin 61-875, dated October 20, 1976, or an FAA- approved equivalent.
(e) Prior to the accumulation of 19,000 flights on propeller pitch lock piston P/N RA 70089, comply with paragraph (d) of this AD.
(f) For the purposes of this AD, a flight is defined as a single takeoff and landing.
(g) This AD requires no further action after compliance with paragraph (d)(2) of this AD.
This amendment becomes effective August 31, 1977.