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.