AD 78-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | TSIO-520-J | TELEDYNE CONTINENTAL MOTORS Model TSIO-520-J and TSIO-520-N Engines |
| engine | Continental Motors | TSIO-520-N | TELEDYNE CONTINENTAL MOTORS Model TSIO-520-J and TSIO-520-N Engines |
Unsafe Condition
Separation of flexible elbow TCM P/N 635930 from the left hand No. 2 cylinder intake tube, leading to possible engine malfunctions or stoppage.
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Required Actions
Replace induction system intake tube TCM P/N 629138 with new tube TCM P/N 642590 within 12 months after the effective date. If not replaced, inspect L.H. elbow installation for full engagement over intake manifold tube and intercooler nipple beads, check clamp torque (30-35 or 25-30 inch pounds depending on clamp type) every 100 hours time in service (up to 125 hours with FAA approval). Discontinue inspections after replacing the intake tube.
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Compliance Time
Within the next 12 months after the effective date of this amendment for replacement. Initial 25 hours time in service after effective date for inspections, then every 100 hours time in service (up to 125 hours with FAA approval).
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Affected Aircraft
TELEDYNE CONTINENTAL MOTORS model TSIO-520-J and TSIO-520-N engines not previously fitted with improved elbow tube TCM P/N 642590, installed in Cessna models 340A, 414, and 340 modified by STCs SA1881SW or SA186NW.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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