AD 98-13-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Limited | Olympus 593 Mk. 610-14-28 | Airworthiness Directives; Rolls-Royce Limited, Aero Division-Bristol, S.N.E.C.M.A Olympus 593 Series Turbojet Engines |
Unsafe Condition
Frayed rear cables in the low pressure (LP) shaft signal system could result in LP shaft signal system failure, leading to LP turbine overspeed, burst, uncontained engine failure, and damage to the aircraft in the event of a LP shaft failure.
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Required Actions
Perform initial and repetitive visual inspections of the LP shaft signal system rear cable for wear within 30 cycles after the effective date, and refurbish the system if wear exceeds limits. Refurbish the system at each engine shop visit or every 200 hours time in service, whichever occurs later.
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Compliance Time
Within 30 cycles in service after the effective date of this AD
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Affected Aircraft
Rolls-Royce Limited, Aero Division-Bristol, S.N.E.C.M.A Olympus 593 Mk. 610-14-28 turbojet engines installed on but not limited to British Aerospace/Aerospatiale Concorde series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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