- Model
- 23
- Data sheet
- TCDSA5CE
- Registered aircraft
- 6 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-160
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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The airworthiness directive
65-26-03 LEARJET: Amdt. 39-160 Part 39 Federal Register November 25, 1965. Applies to Model 23 Airplanes.
Compliance required before further flight, unless already accomplished.
To eliminate the possibility of smoke accumulation in the cabin due to improper ducting, accomplish the following:
(a) Remove necessary interior side panels on right side of baggage compartment near Fuselage Frame 22 (Station 271).
(b) Inspect the one-inch diameter flexible duct (Figure 90-11, Lear Parts Catalog) to ensure that it is the high temperature silicone type (reddish color).
(c) Replace any black duct with high temperature silicone type (reddish color) duct, P/N 2319148-017 (airplane Serial Numbers 004 through 034), or P/N 2319148-022 (airplane Serial Numbers 035 and higher), before further flight.
This directive effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated November 18, 1965.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 6
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.