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Safety Recommendation Details

Safety Recommendation A-79-056
Details
Synopsis: ON SEPTEMBER 2, 1978, ANTILLES AIR BOATS, INC. FLIGHT 941, A GRUMMAN G21A, N7777V, CRASHED WHILE EN ROUTE FROM ST. CROIX TO ST. THOMAS, VIRGIN ISLANDS. THE PILOT AND 3 OF THE 10 PASSENGERS DIED IN THE ACCIDENT.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: DETERMINE THE PERFORMANCE DATA FOR GRUMMAN G21A AIRCRAFT AT CURRENT OPERATING WEIGHTS TO INSURE THAT THE APPROPRIATE CERTIFICATION REQUIREMENTS CAN BE SATISFIED.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: St. Thomas, VI, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA78AA021
Accident Reports: Antilles Air Boats, Inc., Grumman G21A, N7777V
Report #: AAR-79-09
Accident Date: 9/2/1978
Issue Date: 6/29/1979
Date Closed: 1/4/1980
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 1/4/1980
Response: The safety board was not aware that reliable performance data were available for the grumman g-21a, since repeated requests to the faa for such data are available and the faa has initiated action to ensure that currently operating g-21's are maintained in condition in which the original certificated performance can be met we have classified recommendation a-79-56 as closed--acceptable action. We would emphasize again the importance of faa surveillance of commuter and air taxi operatorsof the grumman g-21a to ensure that the aircraft are properly maintained and operated to certification standards.

From: FAA
To: NTSB
Date: 10/10/1979
Response: FAA LTR: WE HAVE NO REASON TO QUESTION THE CLIMB PERFORMANCE DATA OF THE GRUMMAN MODEL G-21A AIRPLANE APPROVED FOR THE MAXIMUM TAKEOFF WEIGHT OF 9,000 POUNDS. WE HAVE DATA TO SUBSTANTIATE CERTIFICATION OF THE G-21A AT 8,000 AND 9,000 POUNDS. THE 9,000 POUND AIRPLANE IS EQUIPPED WITH RETRACTABLE WING TIP FLOATS. THE ACCIDENT AND LATER EVENTS WHICH PROMPTED THE NTSB INVESTIGATION AND QUESTIONS CONCERNING PERFORMANCE INVOLVED THE G-21A'S WHICH ARE EQUIPPED WITH FIXED WING TIP FLOATS. APPARENTLY THE NTSB WAS NOT AWARE THAT ENGINE-OUT PERFORMANCE DATA ARE AVAILABLE.