Thomson B752 at Bristol on Feb 1st 2016, low speed during go around
Last Update: November 10, 2016 / 19:16:25 GMT/Zulu time
Incident Facts
Date of incident
Feb 1, 2016
Classification
Report
Airline
Thomson Airways
Flight number
BY-6131
Departure
Las Palmas, Spain
Destination
Bristol, United Kingdom
Aircraft Registration
G-OOBE
Aircraft Type
Boeing 757-200
ICAO Type Designator
B752
The AAIB released their bulletin stating, that due to the low level go-around altitude 3000 feet and the high rate of climb achieved the flight director had already switched to ALT CAP (altitude capture), the airspeed was decreasing through 160 KIAS and thrust was reducing, when the autopilot was engaged which resulted in the GA mode reactivated at the autopilot, the nose rose to 30.76 degrees nose up with a climb rate in excess of 6000 fpm with the airspeed dropping to 119 KIAS. When the flight director engaged ALTITUDE HOLD the autopilot reduced the attitude to 8 degrees reaching a minimum speed of 110 KIAS, stick shaker did not activate, the speed began to increase to 120 KIAS as the aircraft descended from 3100 to 3000 feet. Flaps were selected to position 5, however, no speed increase was commanded, only 10 seconds later 196 KIAS were selected into the speed window, the situation then normalized.
The AAIB analysed that the first officer had been on sick leave for 5.5 months. The first officer had conducted a simulator refresher training and had been flying the previous sector under the supervision of the type rating examiner, too.
The AAIB analysed:
The approach flown by the co-pilot became de-stabilised and a go-around was initiated. During the go-around a low-level alt cap occurred. The speed at which the go-around was initiated meant the flight directors commanded a high nose-up attitude. The rapidly increasing wind speed with altitude, turbulence and full go-around thrust combined to create a high rate of climb with an ever increasing nose-up attitude. The alt cap annunciation occurred a short time before the autopilot was engaged and initially went unnoticed by the crew, and the AFCS was unable to recover the nose-high upset. The commander was unaware that the autopilot had been engaged so his coaching of the co-pilot to reduce the aircraft’s pitch attitude was ineffective and, with autothrottle and autopilot engaged, the airspeed reduced to a minimum of 110 kt.
The operator’s safety investigation considered that, during the high workload period of a go‑around, there was a degradation in the situational awareness of the crew. The crew were “startled” and their performance was affected, as confirmed by their subsequent selection of flap 5 whilst the aircraft was not accelerating. This was eventually corrected and the aircraft landed safely.
The commander commented that the incident highlighted the importance of FMA monitoring by the PM. With hindsight, he also considered that he should have intervened earlier, and taken control of the aircraft for the go-around.
Incident Facts
Date of incident
Feb 1, 2016
Classification
Report
Airline
Thomson Airways
Flight number
BY-6131
Departure
Las Palmas, Spain
Destination
Bristol, United Kingdom
Aircraft Registration
G-OOBE
Aircraft Type
Boeing 757-200
ICAO Type Designator
B752
This article is published under license from Avherald.com. © of text by Avherald.com.
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