AD 97-04-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker Services | F27 Mark 050 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 100 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 200 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 300 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 400 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 500 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 600 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
| aircraft | Fokker Services | F27 Mark 700 | Airworthiness Directives; Fokker Model F27 Series Airplanes Equipped with Walter Kidde Nose Wheel Steering System |
Unsafe Condition
A reduction in the torque value of the bolt connecting the gearbox housing assembly of the steering unit to the pivot bracket of the nose landing gear (NLG) could result in failure of the dowel pins in the Walter Kidde nose wheel steering system, leading to reduced controllability of the airplane or collapse of the NLG during landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Tighten the bolt to a torque value of 700 to 800 inch-pounds within 500 flight hours or 4 months after the effective date. Revise the FAA-approved maintenance program within 30 days to include periodic inspections of the torque value as per specified documents.
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Compliance Time
Within 500 flight hours after the effective date of this AD, or within 4 months after the effective date of this AD, whichever occurs first
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Affected Aircraft
Fokker Model F27 series airplanes, serial numbers 10102 through 10692 inclusive; equipped with Walter Kidde nose wheel steering system (steering unit gearbox housing assembly) having part number 893954
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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