AD 98-07-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 1329-23A | Airworthiness Directives; Lockheed Model 1329-23 and -25 Series Airplanes |
| aircraft | Lockheed Martin Corporation | 1329-23D | Airworthiness Directives; Lockheed Model 1329-23 and -25 Series Airplanes |
| aircraft | Lockheed Martin Corporation | 1329-23E | Airworthiness Directives; Lockheed Model 1329-23 and -25 Series Airplanes |
| aircraft | Lockheed Martin Corporation | 1329-25 | Airworthiness Directives; Lockheed Model 1329-23 and -25 Series Airplanes |
Unsafe Condition
Displacement of engine tailpipes, which allows hot exhaust gases into the engine bypass duct and could result in escape of hot exhaust gases from the engine tailpipe, causing damage to adjacent structure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the tailpipe V-band coupling part number NH1002299-10 with a new redesigned coupling part number NH1003605-10 within 12 months after the effective date of this AD. Installation must follow specific steps in the applicable maintenance manuals. After 12 months, P/N NH1002299-10 cannot be installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Model 1329-25 series airplanes with engine tailpipe V-band coupling P/N NH1002299-10; Model 1329-23 series airplanes modified with STC SA2326SW and same coupling.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.