Airworthiness Directive · Amendment 39-17062 · Continental Motors, Inc. (CMI) Reciprocating Engines
Continental Motors, Inc. (CMI) Reciprocating Engines
This AD applies to Continental Motors, Inc. (CMI) TSIO-520-B, BB, D, DB, E, EB, J, JB, K, KB, N, NB, UB, VB; TSIO-550-K; TSIOF-550-K; IO-550-N (Turbo-normalized only; STC SE10589SC); with a starter adapter part number (P/N) 642085A17; 642085A18; 642085A19; 642085A20; 642085A22; 642085-1A1, R-642085A17; R-642085A18; R-642085A19; or R-642085A22 installed, where the engine was manufactured before November 20, 2011, or, where a new or rebuilt starter adapter was installed before November 20, 2011.
We are superseding an existing airworthiness directive (AD) for certain Continental Motors, Inc. (CMI) models TSIO-520, TSIO-550-K, TSIOF-550K, and IO-550-N series reciprocating engines with new or rebuilt CMI starter adapters installed between January 1, 2011 and November 20, 2011. That AD currently requires replacing affected CMI starter adapters with starter adapters eligible for installation. This AD requires the same actions, but to an expanded population of reciprocating engines. This AD was prompted by two additional reports received of fractures in starter adapter gear shafts in certain additional part number (P/N) CMI starter adapters since we issued the existing AD. We are issuing this AD to prevent starter adapter gear shaft failure which could cause oil scavenge pump failure and engine in-flight shutdown.
(1) For starter adapters with less than 75 hours of total time-in-service (TIS) on the effective date of this AD, before further flight, replace the starter adapter with a starter adapter eligible for installation.
(2) For starter adapters with between 75 and 100 hours of total TIS, inclusive on the effective date of this AD, within the next 10 hours of engine operation, or before exceeding 100 hours TIS, whichever occurs first, replace the starter adapter with a starter adapter eligible for installation.
(3) For starter adapters with more than 100 hours of total TIS on the effective date of this AD, no further action is required.
For the purpose of this AD, a starter adapter eligible for installation is:
(1) A starter adapter with one of the P/Ns listed in this AD that has a vibro-peened manufacturer code below the ink stamped P/N on the starter adapter, or
(2) A starter adapter with one of the P/Ns listed in this AD that has more than 100 hours total TIS.
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.
