AD 90-21-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Saab AB, Saab Aerosystems | 340A (SAAB SF340A) | Airworthiness Directives; SAAB-SCANIA Model SF-340A Series Airplanes |
Unsafe Condition
Loss of climb performance during single engine operation (i.e., one engine failed) and latent failures in the engine control unit.
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Required Actions
Install modified electrical control units (ECU) in accordance with General Electric Service Bulletin 74-16 within 60 days after November 20, 1989. Remove any relays and associated wiring previously installed per SAAB-Scania Service Bulletins SAAB SF340-61-020 and SAAB SF340-77-003 within 60 days after the effective date of this amendment. Delete specific steps in the AFM's Emergency Procedures Section and Normal Procedures Expanded Checklist after completing the previous actions.
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Compliance Time
Within 60 days after November 20, 1989 (for installing ECUs) and within 60 days after November 14, 1990 (for removing relays and wiring).
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Affected Aircraft
SAAB-SCANIA Model SF-340A series airplanes, Serial Numbers 004 through 159, certified in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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