Airworthiness Directive · Amendment 39-16891 · Continental Motors, Inc. (CMI) Reciprocating Engines
Continental Motors, Inc. (CMI) Reciprocating Engines
Superseded. A later AD replaced this one: AD 2012-10-13. Comply with the one in force.
This emergency 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, 642085A19, 642085A20, 642085-1A1, and R-642085A17, installed, where the engine was manufactured between January 1, 2011 and November 20, 2011, or, where a replacement new or rebuilt starter adapter that was purchased from Continental Motors, Inc. and installed between January 1, 2011 and November 20, 2011.
We are adopting a new airworthiness directive (AD) for certain Continental Motors, Inc. (CMI) models TSIO-520, TSIO-550-K, TSIOF-550K, and IO-550-N series reciprocating engines. This emergency AD was sent previously to all known U.S. owners and operators of these engines. This AD requires replacing affected CMI starter adapters with starter adapters eligible for installation. This AD was prompted by 5 reports received of fractures in starter adapter shaft gears in certain part number (P/N) CMI starter adapters. We are issuing this AD to prevent failure of the starter adapter gear shaft, leading to an inoperable oil scavenge pump 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.
