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Airworthiness Directive 99-16-13

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Official AD 99-16-13 · FR doc 99-20182 · 1999-08-06 · airframe

Airworthiness Directives; MD Helicopters, Inc. (MDHI) Model MD- 900 Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to MDHI Model MD-900 helicopters, that currently requires applying specified serial numbers and establishing life limits for certain parts. This amendment is prompted by additional analysis that supports an increase in the life limit of certain parts. The actions specified by this AD are intended to increase the life limits for various parts.

Which aircraft AD 99-16-13 applies to

MakesMcdonnell Douglas Helicopter Systems
ModelsMD-900
Serial-conditional — narrows to serials 900-00002–900-00012, 900-00002–900-00048.
Part-conditional — 900C2010192-105, 900C2010192-107, 900C2010192-109, 900C2010192-111, 900C2010207-101, 900C3010042-103, 900FP341712-103, 900F2341712-101.

For Model MD-900 helicopters, establishes/revises life limits: nonrotating swashplate assembly P/N 900C2010192-105/-107/-109/-111 (1,800 hr TIS); collective drive link assembly P/N 900C2010207-101 (3,307 hr TIS); self-aligning spherical/slider main rotor bearing P/N 900C3010042-103 (2,030 hr TIS); VSCS bellcrank assembly P/N 900FP341712-103 and bellcrank arm P/N 900F2341712-101 (2,700 hr TIS). Separately, for S/N 900-00002 through 900-00012, mark S/N on mid-forward truss assembly P/N 900F2401200-102 and forward/aft deck-fitting assemblies P/N 900F2401500-103/900F2401600-103; for S/N 900-00002 through 900-00048, mark S/N on left/right VSCS bellcrank assemblies P/N 900F2341712-101/900FP341712-103 and mid-aft truss strut assembly P/N 900F2401300-103; per MDHS Service Bulletin No. 900-039, Revision 2, dated March 12, 1997, within 100 hr TIS after July 10, 1997 or before October 31, 1999, whichever first.

Whether AD 99-16-13 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 99-16-13 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.