AD 88-03-51 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
Unsafe Condition
The nose gear cockpit indication system may indicate erroneous nose gear position due to potential faults in the Eldec Proximity Switch Electronic Control Unit (PSEU) with part numbers 8-410-03, 8-410-04, or 8-410-05.
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Required Actions
Add specified procedures to the AFM Limitations Section, monitor landing gear indications during flight, modify the landing gear control system within 60 days via Service Bulletin 8-32-70 Rev B, and prohibit further flight until irregularities are corrected.
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Compliance Time
Within 24 hours after March 25, 1988 for AFM updates and within 60 days after March 19, 1990 for system modification.
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Affected Aircraft
DeHavilland Model DHC-8-100 series airplanes, serial numbers 3 through 119 inclusive, with Modification No. 8/0467 and Eldec PSEU P/N 8-410-03, 04, or 05.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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