Is AD 01-21220 a recurring Airworthiness Directive?

Yes — AD 01-21220 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Airworthiness Directive 01-21220

Q: Which aircraft does AD 01-21220 apply to?

AD 01-21220 applies to Honeywell International, Alliedsignal, Textron Lycoming — models LTS101-600A-2, LTS101-600A-3, LTS101-600A-3A, LTP101-600A-1A, LTP101-700A-1A, LTS101, LTP101. Serial/part conditions may narrow it to specific aircraft.

recurring

AD 01-21220 · 2001-08-27 · turbine engine

Airworthiness Directives; Honeywell International Inc. (formerly AlliedSignal Inc. and Textron Lycoming Inc.) LTS101 Series Turboshaft and LTP101 Series Turboprop Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), AD 95-09-02, that applies to Honeywell International Inc. (formerly AlliedSignal Inc. and Textron Lycoming Inc.) LTS101 series turboshaft and LTP101 series turboprop engines. That AD superseded priority letter AD 94-19-01 and currently requires initial and repetitive inspections of the engine fuel pump internal drive splines for wear and replacement of engine fuel pumps that exhibit wear beyond specified limits.This amendment requires a reduction in inspection intervals for the engine fuel pump internal drive splines. This amendment is prompted by a report from the engine manufacturer that 13 percent of the pumps installed on aircraft that were returned from the field for the required 900-hour interval inspection revealed excessive internal drive spline wear. The actions specified by this AD are intended to prevent worn splines in fuel pumps which could cause engine fuel pump failure, which can result in total engine power loss and possible loss of the aircraft.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 01-21220 applies to

MakesHoneywell InternationalAlliedsignalTextron Lycoming

ModelsLTS101-600A-2, LTS101-600A-3, LTS101-600A-3A, LTP101-600A-1A, LTP101-700A-1A, LTS101, LTP101

Part-conditional — 4-301-128-01, 4-301-128-02, 4-301-128-03, 4-301-128-04, 4-301-128-05, 4-301-128-06, 4-301-128-07, 4-301-128-08.

Applies only to LTS101-600A-2/-3/-3A turboshaft and LTP101-600A-1A/-700A-1A turboprop engines incorporating a Chandler Evans Company (CECO) engine fuel pump, P/N 4-301-128-01 through -11. Not applicable to engines installed on twin-engine aircraft.

Whether AD 01-21220 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 01-21220 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.