AD 2009-24-21

Recurring final rule
Data completeness: 80%

Airworthiness Directives; McDonnell Douglas Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and McDonnell Douglas Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

AD Number
2009-24-21
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2009-0658
FR Citation
74 FR 63578

Applicability

TypeManufacturerModelDetails
aircraft McDonnell Douglas DC-9-14 Airworthiness Directives; McDonnell Douglas Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and McDonnell Douglas Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

Unsafe Condition

Fatigue cracks in the shock strut cylinder of the main landing gear (MLG), which could result in a collapsed MLG during takeoff or landing, and possible reduced structural integrity of the airplane.

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

Required Actions

Inspect the MLG shock strut cylinders for cracks using specified non-destructive testing methods. Review maintenance records to determine MLG service history and number of landings. Perform initial inspection before the accumulation of 60,000 total landings or at the applicable grace period, whichever is later.

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

Compliance Time

Before the accumulation of 60,000 total landings on the MLG, or at the applicable grace period specified in Table 1, whichever occurs later.

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

Affected Aircraft

All McDonnell Douglas Model DC-9-14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-33F, DC-9-34, DC-9-34F, DC-9-32F (C-9A, C-9B), DC-9-41, and DC-9-51 airplanes, certificated in any category.

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

Source: Official FAA Source ↗

Retrieved: Apr 4, 2026

Rights: U.S. Government Public Domain

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Related Airworthiness Directives

2010-23-10 Recurring

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Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes

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Effective: Dec 14, 2010 Category: aircraft

2009-03-03

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2006-18-05

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Airworthiness Directives; McDonnell Douglas Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; Model DC-9-21 Airplanes; Model DC-9-30 Series Airplanes; Model DC-9-41 Airplanes; and Model DC-9-51 Airplanes

Unsafe Condition: which could cause electrical arcing and consequent fire on the airplane.

Effective: Oct 11, 2006 Category: aircraft

2006-01-02 Recurring

final rule

Airworthiness Directives; McDonnell Douglas Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) Airplanes; Model MD-88 Airplanes; and Model MD-90-30 Airplanes

Unsafe Condition: unsafe condition.

Effective: Feb 22, 2006 Category: aircraft

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