# AD 74-23-01: External Power Receptacle

- Type: Airworthiness directive
- Status: Current
- Products: Learjet 23 and 24
- Effective: November 5, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2000
- Registered aircraft: 13 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/34AEAC60AEA76DC98625696E00542930.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-23-01

## The airworthiness directive

74-23-01 GATES LEARJET: Amendment 39-2000. Applies to Model 23 (Serial Numbers 23-003, 23-005, 23-006, and 23-008 through 23-099) and Model 24 (Serial Numbers 24-100 through 24-134) airplanes.

Compliance: Required within the next 10 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent possible shorting of the external power receptacle terminals and battery positive terminal to adjacent structure, control cables and equipment, accomplish the following:

A) On Model 23 (Serial Numbers 23-003, 23-005, 23-006, 23-008 and 23-009) airplanes, check to determine if the battery quick disconnects are installed and visually inspect the external power receptacle terminals for sealing and if not installed and/or properly sealed, prior to further flight, comply with Gates Learjet Service Bulletin No. SB-23/24-258, or later approved revisions.

B) On Model 23 (Serial Numbers 23-010 thru 23-099) and Model 24 (Special Numbers 24-100thru 24-134) airplanes, visually inspect the external power receptacle terminals for sealing and if not properly sealed, prior to further flight, insulate the terminals in accordance with Gates Learjet Service Bulletin SB-23/24-258 or later approved revisions.

C) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

This amendment becomes effective November 5, 1974.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A10CE](https://openairdocs.org/tcds/A10CE): Learjet Inc.; names 1 of 29 models: 24
- [TCDS A5CE](https://openairdocs.org/tcds/A5CE): Learjet Inc.; names 1 of 1 models: 23

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 13 (13 by airframe model, 0 by engine model)
- Makers: Learjet 13

Models with the most aircraft:

- [Learjet 24](https://openairdocs.org/model/learjet-24): 7 aircraft (airframe model)
- [Learjet 23](https://openairdocs.org/model/learjet-23): 6 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/74-23-01/models.md
Every aircraft: https://openairdocs.org/ad/74-23-01/aircraft.md

Its text cites no advisory circulars or STCs.

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