AD 99-19-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker Services | F27 Mark 050 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 100 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 200 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 300 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 400 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 500 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 600 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
| aircraft | Fokker Services | F27 Mark 700 | Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes and Model F27 Mark 050 Series Airplanes |
Unsafe Condition
Failure to activate the wing and tail pneumatic deicing boots at the first signs of ice accumulation can lead to reduced controllability due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Airplane Flight Manual (AFM) Limitations Section to require activation of the deicing boots at the first sign of ice formation or ice detector annunciation, and specify continued use in 'heavy' automatic cycling mode or manual cycling as needed. The AFM must also state deactivation is only allowed after completing an entire deicing cycle post-icing conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.