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G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 25.

and missing polyurethane tape (Figure 16). These findings were all rectified by the aircraft operator. Figure 16 Cracked and missing polyurethane tape in cargo deck floor area near L1 door © Crown copyright 2026 25 All times are UTC
Open official document at PDF page 25AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 26.

Overspeed event The aircraft reached a maximum 383 KIAS during the overspeed event. The aircraft operator stated that at the altitude of the overspeed the VMO was 365 KIAS, so the speed exceedance was 18 kt. They stated that an
Open official document at PDF page 26AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 34.

the Boeing 747-400 Maintenance Steering Group; this group includes participants from aircraft operators. The group was expected to meet in the second quarter of 2026, but at the time of writing no meeting date had been scheduled. The aircraft manufacturer
Open official document at PDF page 34AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 37.

AAIB Bulletin: G-ONEE AAIB-29853 The aircraft operator is investigating the prior maintenance of the cargo deck floor area and has initiated an inspection of this area on their fleet of 747 freighter aircraft. The aircraft
Open official document at PDF page 37AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 40.

been closed while it was raining (see Safety Actions section to see action taken by the aircraft operator to address this), but the amount of water on the floor reported by the engineers should not have caused an issue to
Open official document at PDF page 40AAIB final report: G-ONEE

G-ONEE: electrical failures and unreliable airspeed

Printed page label not indexed. PDF page 41.

an L-bracket on either side of PDU 4. These cracks were only discovered because the aircraft operator decided to inspect it following this incident. The aircraft manufacturer stated that water ingress into the MEC could result in loss of flight
Open official document at PDF page 41AAIB final report: G-ONEE