AD 93-16-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | IO-520-B | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-BA | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-BB | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-C | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-CB | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-M | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-520-MB | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-550-A | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-550-B | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
| engine | Continental Motors | IO-550-C | TELEDYNE CONTINENTAL MOTORS Models IO-520B, IO-520BA, IO-520BB, IO-520C, IO- 520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL- 550A and TSIOL-550B Engines |
Unsafe Condition
Fuel pump drive shaft disengagement and loss of engine power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 30 hours time in service after the effective date, visually inspect the fuel pump to determine the installed fuel pump drive shaft and coupling combination. Replace fuel pump drive couplings with serviceable ones (P/N 653359) if required to ensure minimum coupling engagement as per TCM MSB M93-9, Rev 1. Alternative compliance may be approved by the Atlanta Aircraft Certification Office.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 30 hours time in service after the effective date of this AD
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Affected Aircraft
Teledyne Continental Motors engines models IO-520B, IO-520BA, IO-520BB, IO-520C, IO-520CB, IO-520M, IO-520MB; IO-550A, IO-550B, IO-550C, IO-550G; TSIO-520B, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-520E, TSIO-520EB, TSIO-520J, TSIO-520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSIO-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL-550A and TSIOL-550B with serial numbers lower than those in TCM MSB M93-9, Rev 1, or equipped with fuel pumps replaced prior to AD effective date using P/N 646176 drive shaft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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