The Charity
Aviation
Maritime
Report text (summarized to protect reporter’s confidentiality):
The ground handling function at [aerodrome name] has adopted a policy of leaving towbars attached to aircraft. The risk of engine start with the towbar attached is now considerably higher. There are many AAIB reports into engine starts with towbars attached. It is considered bad practice to leave ground handling equipment attached to the aircraft when not in use. Having spoken with the aerodrome operator, who also provides the ground handling service, which is mandatory, they are unwilling to consider reversing their policy change and have dismissed my safety concerns. Their position is that if the operating crew fail to remove the towbar, then it would be their own fault and not that of the aerodrome operator. There appears no evidence of a safety culture here, or even a basic understanding of human factors.
Company Comment
The Airfield operator has informed CHIRP that at the time of writing no safety reports had been received from airfield users regarding the policy and therefore was curious why the reporter felt they would report to CHIRP first and not the airfield safety team. The airfield operator also said the policy was in place due to some specific operating requirements at the airfield which had been discussed at length to airfield users before the policy was promulgated, therefore although not optimal, it was a considered an operating necessity that is mitigated by discussion and raising awareness of the potential issues.
CHIRP recognized that this airfield policy, as stated by the reporter, increases the risk of a tow bar being left on an aircraft before start, or remaining on the aircraft during, and worst case after take-off. Such a change in policy, with associated hazards, should be managed by the airfield SMS team with agreed mitigations put in place as deemed necessary. Being fully transparent with such a safety process will help to create a reporting culture when those involved want to make their views known to those responsible and accountable.
CHIRP considered that if the policy remains then it should be clearly stated in SOPs, with a robust, consistent procedure in place, including mitigations to minimise opportunities to miss the towbar during walk round such as, for example, placing a noticeable marker/flag on the towbar, or use of dayglo paint on towbar, for better sighting. Ultimately however, and as ever in aviation, it is the PIC’s responsibility to ensure the aircraft they are in command of is fit and ready to fly, and if they have to operate in an environment they personally feel is less than ideal, as in the case described by the reporter, then they should set some additional mitigations of their own to best protect themselves from an incident or accident occurring.
It is worth reminding FEEDBACK readers that on 19 Aug 2019 an Embraer 145 landing at London Southend Airport ran over a general aviation towbar which had been dropped on the runway. No damage was caused to the aircraft. The investigation found that the towbar had fallen from a Cessna 210 which departed Southend Airport 30 minutes before. The Cessna pilot had likely been distracted during his pre-flight checks by an earlier road traffic incident in which he was involved and had inadvertently left the towbar attached.
A Safety Recommendation was made to the CAA to improve the visibility of general aviation ground equipment.
The AAIB also highlighted to CHIRP three more recent tow bar occurrences:
On 6 June 2021, the pilot of an American AA-1 flying from a location in North Yorkshire took off with the towbar still attached. The pilot was alerted to this over the radio and returned to land. The tow bar came off on the runway and the propeller suffered slight damage to one propeller blade tip. The pilot reported that prior to the flight he had pulled the aircraft to the fuel pump but parked it further away than normal. This meant that he didn’t need to push the aircraft backwards before starting up. He had also been distracted from his routine by walking away to talk to another pilot before entering the aircraft.
On 28 August 2021 the pilot of a Cessna F172N at Glasgow Airport inadvertently departed with a towbar attached to the aircraft’s nosewheel, having been distracted by a passenger during the pre-flight inspection. The operator has informed its members about this incident and has taken action to enhance the handling and conspicuity of its towbars.
Finally on 22 April 2024 the pilot of a Piper PA-28-140 in Perthshire took off with the towbar still attached. The tower informed the pilot on the radio and then recovered the towbar which had detached during the take off. The aircraft landed without incident and subsequent inspection showed a propeller strike. The pilot considered he became distracted during the preparation of the aircraft for take off and stated that he normally placed the towbar on the wing by the door after use. He stated that he planned to add a note on his checklist to remove the towbar to help prevent future recurrence.
Possible Human factors considerations that could contribute to such an event: