AD 2009-20-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-300 | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes Equipped With a Digital Transient Suppression Device (DTSD) Installed in Accordance With Supplemental Type Certificate (STC) ST00127BO |
Unsafe Condition
Failure of the Digital Transient Suppression Device (DTSD) could lead to improper operation of the fuel system, potentially resulting in unsafe conditions.
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Required Actions
Revise the maintenance program to include new fuel system limitations for airplanes modified in accordance with Supplemental Type Certificate ST00127BO. Inspect and check the DTSDs, and perform corrective actions if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 737-300, -400, and -500 series airplanes equipped with a Digital Transient Suppression Device (DTSD) installed in accordance with Supplemental Type Certificate (STC) ST00127BO.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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