AD 2005-23-03

final rule
Data completeness: 70%

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, and 25F Airplanes

AD Number
2005-23-03
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2005-22169
FR Citation
70 FR 69069

Applicability

TypeManufacturerModelDetails
aircraft Learjet 23 Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, and 25F Airplanes

Unsafe Condition

Failure of the spherical accumulator for the main hydraulic system due to fatigue cracking on the threads, which could result in the loss of hydraulic power, damage to the surrounding airplane structure, and loss of airplane control.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Replace the spherical accumulator with a new cylindrical accumulator within 60 days after the effective date. For certain airplanes, relocate the accumulator pressure gauge prior to or concurrently with the accumulator replacement.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Within 60 days after the effective date of this AD.

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, and 25F airplanes, with serial numbers 23-003 through 23-099, 24-100 through 24-284, and 25-003 through 25-153.

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

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View Official Source ↗ Find More ADs for Learjet 23

Related Airworthiness Directives

2007-04-18

final rule

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes

Unsafe Condition: could result in inadvertent fuel transfer by the left or right wing fuel system and subsequent over-limit fuel imbalance between the left and right wing fuel loads.

Effective: Mar 23, 2007 Category: aircraft

2005-23-06

final rule

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24D, 24D-A, 24E, 24F, 25, 25A, 25B, 25C, 25D, and 25F Airplanes Modified by Supplemental Type Certificate SA1731SW, SA1669SW, or SA1670SW

Unsafe Condition: could result in the loss of hydraulic power and damage to the surrounding airplane structure.

Effective: Dec 19, 2005 Category: aircraft

2005-16-09 Recurring

final rule

Airworthiness Directives; Learjet Model 23, 24, 25, 35, and 36 Airplanes

Unsafe Condition: The FAA is superseding an existing airworthiness directive (AD), which applies to certain Learjet Model 23, 24, 25, 35, and 36 airplanes. That AD currently requires repetitive inspections to detect...

Effective: Sep 13, 2005 Category: aircraft

2005-13-36

final rule

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), and 36 Airplanes

Unsafe Condition: The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-...

Effective: Aug 9, 2005 Category: aircraft

View all Learjet ADs →