AD 88-03-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-81, -82, and -83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-81, -82, and -83 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-81, -82, and -83 Series Airplanes |
Unsafe Condition
Erroneous information transmission from the Digital Air Data Computer (DADC) to the Digital Flight Guidance Computer (DFGC) due to electrical transients.
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Required Actions
Inspect Honeywell P/N HG280D80 DADC to determine if Modification 8 is installed. If installed but not identified, identify it per service bulletin. If not installed, modify and identify the DADC as per service bulletin. Alternate means of compliance may be approved.
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Compliance Time
Within 12 months after the effective date of this airworthiness directive (March 11, 1988).
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Affected Aircraft
McDonnell Douglas Model DC-9-81, -82, and -83 series airplanes listed in McDonnell Douglas Service Bulletin 34-177, dated April 28, 1987.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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