AD 91-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A320-111 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-211 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-212 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-214 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-231 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-232 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
| aircraft | Airbus | A320-233 | Airworthiness Directives; AIRBUS INDUSTRIE Model A320 Series Airplanes |
Unsafe Condition
Freezing of relay 36 CE 3 in the energized state, which when coupled with an erroneous command from the SEC 2 computer could result in disconnection of ELAC 1 and ELAC 2 computers and a runaway of the trimmable horizontal stabilizer (THS).
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Required Actions
Install a new STP1 relay (P/N D0003002100100) with a date code newer than or equal to 88/41 A, following Airbus Industrie All Operator Telex 27-03, Revision 3. Compliance times vary based on accumulated landings since retrofit with SEC P/N B372ABM0606/B372BAM0404.
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Compliance Time
Within 200 landings after the effective date, prior to 1,600 total landings since retrofit, or within 800 landings after the effective date, depending on accumulated landings since retrofit.
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Affected Aircraft
Airbus Model A320 series airplanes through manufacturer's serial number 109 with Modification 21659 not accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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