- Effective
- May 17, 1966
- Models
- 23, 24
- Registered aircraft
- 13 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-237
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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On this page
The airworthiness directive
66-13-04 LEARJET: Amdt. 39-237 Part 39 Federal Register May 17, 1966. Applies to Models 23 and 24 Airplanes.
Compliance required before further flight, unless already accomplished, except that the airplane may be flown to a base where the repair can be performed, provided the following restrictions are contained on a placard in clear view of the pilot:
"(a) No passengers may be carried.
"(b) Monitor the cabin pressure indicator for proper pressurization control. If automatic and/or manual control of the cabin pressure is not properly effective:
"(1) Turn air bleed off to shutoff bleed air.
"(2) Reduce power to reduce bleed air pressure as necessary.
"(3) Don oxygen masks.
"(4) Expedite descent to a safe altitude."
Modify the pressure control static air system in accordance with Lear Service Kit SK23/24-230 or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Central Region.
This directive effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated May 10, 1966.
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 13
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1965 | 5 |
|---|---|
| 1966 | 3 |
| 1968 | 1 |
4 with no year recorded