A-94-138
NTSB Safety Recommendation — Aviation
Recommendation text
THE NSTB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN ADVISORY CIRCULAR CONCERNING THE FLIGHT OF SMALL GENERAL AVIATION AIRPLANES IN ICING CONDITIONS. THE AC SHOULD CONTAIN CURRENT TECHNOLOGICAL/OPERATIONAL INFORMATION AIMED AT HELPING PILOTS MINIMIZE THE POTENTIAL HAZARDS OF AN ICING ENCOUNTER AND INCLUDE SPECIFIC EXPLANATORY MATERIAL RELATED TO THE IMPORTANCE OF MAINTAINING AN APPROPRIATE MINIMUM AIRSPEED DURING SUSTAINED FLIGHT IN ICING CONDITIONS; THE HAZARDS OF AN ICE-INDUCED TAILPLANE STALL, THE EFFECTS OF FLAP EXTENSION AND AIRSPEED ON AN ICE-CONTAMINATED AIRPLANE; AIRCRAFT PERFORMANCE DEGRADATION DUE TO ICING BECAUSE OF INCREASED DRAG AND STALLING SPEEDS; THE RELATIVELY HIGH ICE COLLECTION EFFICIENCY OF TAILPLANE SURFACES; WAYS AND MEANS OF RELIABLY DETERMINING THE EXISTENCE AND EXTENT OF TAILPLANE ICING; AND THE LIMITATIONS OF AIRCRAFT CERTIFIED FOR FLIGHT IN ICING CONDITIONS TO PROVIDE PROTECTION AGAINST FREEZING RAIN, FREEZING DRIZZLE, AND MIXED ICING CONDITIONS.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to issue an advisory circular for pilots of small general aviation airplanes flying in icing conditions. The circular should provide current information on technology and operations to help pilots reduce icing hazards, with specific explanations on maintaining proper airspeed, risks of ice-induced tailplane stalls, effects of flap settings and airspeed on ice-contaminated aircraft, performance loss due to increased drag and higher stalling speeds, the high ice collection on tailplane surfaces, methods to detect tailplane icing, and the limits of aircraft certified for icing protection against freezing rain, freezing drizzle, and mixed conditions.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Acceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Nov 26, 1996 |
| NTSB number | SEA93FA026 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).