TUI B738 at Aberdeen on Sep 11th 2021, deviation from flightpath during go around

Last Update: December 2, 2021 / 11:42:08 GMT/Zulu time

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Incident Facts

Date of incident
Sep 11, 2021

Classification
Report

Flight number
BY-1665

Aircraft Registration
G-FDZF

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

A TUI Airways Boeing 737-800, registration G-FDZF performing flight BY-1665 from Palma Mallorca,SP (Spain) to Aberdeen,SC (UK) with 67 passengers and 6 crew, was on approach to Aberdeen's runway 34 in instrument meteorologic conditions when descending through 5000 feet the air traffic controller advised the crew they might need to abort their approach, a search and rescue helicopter about to depart would receive priority once airborne, in this case they would be required to climb to 3000 feet at runway heading. The aircraft established on the ILS approach to runway 34 and was descending through 2600 feet on single autopilot, flaps at 15 degrees and gear down already, ATC instructed the crew to abort the approach, climb to 3000 feet and turn left heading 270. The crew pressed TOGA, initiated the climb and the left turn. Just before reaching 3000 feet MSL the aircraft began to descend again reaching up to 3100 fpm sink rate, tower controller noticed the aircraft was descending again and notified approach control who contacted the crew just as the crew was pulling the nose up and returned the aircraft into a climb at 286 KIAS (speed selected by the crew was 200 KIAS). The aircraft levelled off at 3000 feet, the crew re-engaged the autopilot. The aircraft positioned for another approach to Aberdeen and landed safely on runway 34.

The AAIB released their special bulletin stating:

The Boeing 737-800 is a dual autopilot, CAT III capable aircraft. Normal procedures, as outlined by the manufacturer, require the use of a single autopilot on an ILS approach unless the intention is to conduct a CAT II or III approach and landing. Automatic go-arounds are only available from a dual autopilot approach. The autopilot/flight director go-around mode is engaged by pressing the Takeoff/Go-around (TO/GA) switches. Pressing either of the switches when the engagement criteria are met will disconnect the single autopilot (if connected) and place the flight directors in go-around mode. The autothrottle (if engaged) will move to go-around thrust, and the flight directors will then command 15º nose-up pitch until the aircraft reaches a programmed rate of climb. Flight director pitch commands then target airspeed for each flap setting, based on a maximum takeoff weight calculation.

The AAIB annotated: "The pilots of G-FDZF, like many other pilots, had not flown for significant periods during the 18 months before this incident. Although the investigation has not established a link between this incident and a lack of recent line flying, it is clearly a possibility."

The investigation is ongoing.
Incident Facts

Date of incident
Sep 11, 2021

Classification
Report

Flight number
BY-1665

Aircraft Registration
G-FDZF

Aircraft Type
Boeing 737-800

ICAO Type Designator
B738

This article is published under license from Avherald.com. © of text by Avherald.com.
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