AD 2006-18-11

Recurring final rule
Data completeness: 80%

Airworthiness Directives; Boeing Model 737-200, -300, -400, and -500 Series Airplanes Equipped With an Auxiliary Fuel System Installed in Accordance With Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY

AD Number
2006-18-11
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2006-25746
FR Citation
71 FR 53562

Applicability

TypeManufacturerModelDetails
aircraft Boeing 737-200 Airworthiness Directives; Boeing Model 737-200, -300, -400, and -500 Series Airplanes Equipped With an Auxiliary Fuel System Installed in Accordance With Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY

Unsafe Condition

Structural overload of the auxiliary fuel tank support structure could cause the floor beams to fail, resulting in damage to the primary flight controls and the auxiliary power unit (APU) fuel lines that pass through the floor beams, and consequent loss of control of the airplane. Structural overload of the cargo barriers could cause the barriers to fail, allowing the cargo to shift, resulting in possible damage to the auxiliary fuel tanks, residual fuel leakage, and consequent increased risk of a fire.

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

Required Actions

Deactivate the auxiliary fuel system, install new cargo loading weight limit and 'INOP' placards as applicable, and revise the Limitations section of the airplane flight manual to limit the maximum cargo weight. Additionally, vent any residual air pressure from the auxiliary fuel tanks following each flight.

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Compliance Time

Before further flight

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Affected Aircraft

Boeing Model 737-200, -300, -400, and -500 series airplanes equipped with an auxiliary fuel system installed in accordance with Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY.

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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