Stall warnings in high capacity aircraft: The Australian context 2008 ...

ATSB – AR-2012-172
Table 1: Aircraft models with reported stall warnings, 2008 to 2012
Aircraft model Number
of stall
warning
related
reports 4
Total
rate per
100,000
hours 5
Number of
genuine
stick shaker
activations 6
Genuine rate
per 100,000
hours 5
Number of
spurious stall
warnings
(excluding
system
Number of
stall
warning
system
failures
System
failure
rate per
100,000
hours 5
failures) 7
Bombardier
54 28.6 16 8.5 1 19 10.1
DHC-8-300
Boeing 767-300 52 12.6 44 10.6 2 2 0.5
Boeing 747-400 49 7.3 49 7.3 0 0 0
Boeing 737-700
32 1.7 22 1.2 2 7 0.4
/ 800
Boeing 717-200 18 10.7 14 8.3 0 4 2.4
Fokker F100 13 24.9 1 1.9 0 12 23.0
Bombardier
8 3.8 3 1.4 0 5 2.4
DHC-8-400
(Q400)
Embraer E-190 5 2.2 4 1.8 0 1 0.4
Boeing 737-400 2 0.6 0 0 1 1 0.3
Boeing 747-300 1 7.6 1 7.6 0 0 0
Boeing 777-300 2 2.3 2 2.3 0 0 0
Airbus A320-200 3 0.4 2 0.2 0 1 0.1
ATR 42-300 1 3.5 1 3.5 0 0 0
British
1 4.4 1 4.4 0 0 0
Aerospace BAe
146 / Avro RJ
Embraer E-170 1 1.4 0 0 0 1 1.4
Airbus A330-300 1 0.2 1 0.2 0 0 0
Airbus A380-800 1 0.7 1 0.7 0 0 0
Bombardier
1 N/A 1 N/A 0 0 N/A
DHC-8-200
TOTAL 245 - 163 - 6 53 -
Stall warnings in Australia between 2008 and 2012 were most commonly associated with
Bombardier DHC-8-300, Boeing 767-300, Boeing 747-400, and Boeing 737-700/800 aircraft.
These aircraft were involved in 76 per cent of the stall warning-related occurrences reported to the
ATSB over this period, and 81 per cent of the genuine stick shaker activations. When the flying
activity of each aircraft type over this 5 year period is considered, the Bombardier DHC-8-300 and
Fokker 100, followed by Boeing 767 and Boeing 717, had the highest rate of stall warning-related
occurrences reported, each with over 10 occurrences per 100,000 hours flown. The Boeing 767
had the highest rate of genuine stick shaker activations (10.6 per 100,000 hours flown).
4
5
6
7
All 245 stall warning-related occurrences reported to the ATSB between 2008 and 2012. Includes stall warning system
failures, many of which did not result in a stick shaker activation.
De-identified domestic and international hours flown (Australian aircraft only) by aircraft type information for the 2008 to
2012 period provided by the Bureau of Infrastructure, Transport, and Regional Economics (BITRE).
Only includes genuine stall warning system activations (stick shaker or flight envelope protection). Stall warning system
failures leading to one of these cockpit indications are counted separately in this table.
This column does not include the 23 stall warnings reported to the ATSB where it could not be determined from the
information reported whether a stick shaker/flight protection activation was genuine or spurious. A rate is not provided
due to the low numbers.
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