AD 2023-04-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | Aerospace Technologies | Airworthiness Directives; Continental Aerospace Technologies, Inc. Reciprocating Engines |
Unsafe Condition
improper installation and inspection of counterweight retaining rings in the engine crankshaft counterweight groove during manufacture, which may result in loss of retention of the counterweight, loss of engine oil pressure, catastrophic engine damage, and possible engine seizure.
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Required Actions
inspect the crankshaft assembly for proper installation of the counterweight retaining rings in the counterweight groove, and corrective actions if improper installation is found, as specified in Continental Mandatory Service Bulletin MSB23-01, Revision A, dated February 16, 2023.
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Compliance Time
Before further flight
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Affected Aircraft
Continental Aerospace Technologies, Inc. GTSIO-520-C, -D, -H, -K, -L, -M, -N, and -S; IO-360-A, -AB, -AF, -C, -CB, -D, -DB, -E, -ES, -G, -GB, -H, -HB, -J, -JB, -K, and -KB; IO-470-D, -E, -G, -H, -J, -K, -L, -M, -N, -P, -R, -S, -T, -U, -V, and -VO; IO-520-A, -B, -BA, -BB, -C, -CB, -D, -E, -F, -J, -K, -L, -M, and -MB; IO-550-A, -B, -C, -D, -E, -F, -G, -L, -N, -P, and -R; LTSIO-360-E, -EB, -KB, and -RB; LTSIO-520-AE; O-470-A, -B, -E, -G, -H, -J, -K, -L, -M, -N, -R, -S, -T, and -U; TSIO-360-A, -AB, -B, -BB, -C, -CB, -D, -DB, -E, -EB, -G, -GB, -H, -HB, -JB, -KB, -LB, -MB, -RB, and -SB; TSIO-520-A, -AE, -AF, -B, -BB, -BE, -C, -CE, -D, -DB, -E, -EB, -G, -H, -J, -JB, -K, -KB, -L, -LB, -M, -NB, -P, -R, -T, -UB, -VB, and -WB; TSIO-550-A, -B, -C, -E, -G, -K, and -N; TSIOF-550-K; and TSIOL-550-A, -B, and -C model reciprocating engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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