Airworthiness Directive · Amendment 39-19409 · Main landing gear and 3220 nose landing gear
Sikorsky Aircraft Corporation Helicopters
This AD applies to Sikorsky Model S-92A helicopters, certificated in any category.
We are superseding Airworthiness Directive (AD) 2017-14-03 for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. AD 2017-14-03 required an inspection and reduced the retirement lives of certain landing gear components. This new AD retains the requirements of AD 2017-14-03, reduces the retirement lives of additional landing gear components, and requires repeating the inspection. This AD was prompted by a revised analysis of the fatigue life of the landing gear. The actions of this AD are intended to prevent an unsafe condition on these products.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Before further flight, remove from service any part that has accumulated the number of landing cycles listed in Table 1 to paragraph (f)(1) of this AD. Thereafter, remove from service any part before accumulating the number of landing cycles listed in Table 1 to paragraph (f)(1) of this AD. For purposes of this AD, a landing cycle is counted anytime the helicopter lifts off into the air and then lands again regardless of the duration of the landing and regardless of whether the engine is shut down. If the number of landing cycles in unknown, multiply the number of hours time-in-service by 4.5 to determine the number of landing cycles.
| Part name | Part No. (P/N) | Life limit |
|---|---|---|
| Main landing gear (MLG) wheel axle | 2392-2334-001 | 22,300 landing cycles. |
| MLG or nose landing gear (NLG) threaded hinge pin | 2392-2311-003 | 26,100 landing cycles. |
| NLG cylinder | 2392-4006-005 | 26,300 landing cycles. |
| NLG hinge pin | 2392-4312-003 | 26,700 landing cycles. |
| Landing gear actuator rod end | 2392-0876-901 | 41,700 landing cycles. |
| MLG cylinder | 2392-2006-005 | 76,300 landing cycles. |
| MLG pin outboard | 2392-2312-003 | 50,300 landing cycles. |
| MLG bulkhead (left-hand side) | 92201-08111-105 92201-08111-107 92201-08111-109 | 58,400 landing cycles. |
| MLG bulkhead (right-hand side) | 92201-08111-106 92201-08111-108 92201-08111-110 | 58,400 landing cycles. |
(2) For helicopters with 31,600 or more landing cycles and an NLG airframe fitting assembly P/N 92209-01101-041 installed, before further flight and thereafter at intervals not to exceed 1,989 landing cycles:
(i) Using a 10X or higher power magnifying glass, inspect each bushing (P/N 92209-01101-102 and P/N 92209-01101-103) and all visible surfaces of mating lug fittings adjacent to each bushing for fretting, corrosion, wear, and scratches. If there is fretting, corrosion, wear, or a scratch more than 0.0005 inch deep, replace the NLG airframe fitting assembly before further flight.
(ii) Ultrasonic inspect each NLG actuator fitting P/N 92209-01101-101 in accordance with Sikorsky Ultrasonic Inspection Technique No. UT 5077, Revision 0, dated July 25, 2014 (UT 5077), except you are not required to report to or contact Sikorsky. If there are any anomalies or suspect indications, replace the NLG actuator fitting before further flight.
Note 1 to paragraph (f)(2)(ii) of this AD: A copy of UT 5077 is attached to Sikorsky S-92 Helicopter Alert Service Bulletin 92-32-004, Basic Issue, dated January 30, 2015.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
