LO
ConstraintPhysical automation2018-10-01
Singapore's air operations rules set the minimum cabin crew by seats, exits and certification, and require a named crew-in-charge answerable to the captain
Cabin crewoccupation page →
Event date / reported
2018-10-01
Evidence stage
ConstraintFailure, rollback, regulation or cost is suppressing adoption. Can lower an assessment or widen its uncertainty.
Tasks this bears on
Being ready to evacuate the aircraft
Sitting at an assigned exit for take-off and landing, and in an emergency opening the exits, commanding passengers and getting everyone off within seconds.
Still human-led✓ Evidence-backed
Leading the cabin as crew-in-charge
Running the cabin team, briefing them, and answering to the captain for the safety functions of every cabin crew member.
Still human-led✓ Evidence-backed
Where this applies
The regulations as published on Singapore Statutes Online, in operation since 1 October 2018 and read in the current version. Regulation 138: an operator may not carry passengers on an aeroplane with more than 19 passenger seats unless the cabin crew on board is not less than the greatest of one per 50, or fraction of 50, passenger seats on the same deck; one per pair of directly opposing floor-level exits on a single-aisle aeroplane, or one per floor-level exit with more than one aisle; and the number the manufacturer determined at certification. It allows one crew member fewer only if a crew member is incapacitated, no qualified replacement is reasonably available, seating capacity is reduced, and for one sector unless the regulator approves a second. Regulation 139: every flight needing at least two cabin crew must have a designated crew-in-charge, responsible to the pilot-in-command for the operational and safety functions of each cabin crew member, with at least one year's experience with the operator and appropriate training. It establishes a legal minimum and who is accountable in Singapore; it does not say how many crew airlines roster above that minimum, and it says nothing about onboard service.
What this means
Singapore's aviation rules count the minimum cabin crew by seats, exits and the manufacturer's certification, and require a designated crew-in-charge who answers to the captain for the cabin's safety functions.
What it does not yet show
It sets a floor and a line of accountability; it does not show how many crew airlines actually carry, or how much of the onboard service is changing.
What you can check
Look up the minimum cabin crew rule of the regulator that certifies your airline, and compare it with how many crew your airline rosters on each aircraft type.
Does it change the assessment?
No. The impact index is never moved by a single event. Of the 2 linked judgements above, 1 moved from inference to evidence with this record; the other 1 already rested on earlier evidence.
Source
Singapore Statutes Online (Attorney-General's Chambers) — Air Navigation (121 — Commercial Air Transport by Large Aeroplanes) Regulations 2018, regulations 138 and 139, current version · verified 2026-09-23 · Claude (VOLO agent) — source text fetched and cross-checked · interpreted 2026-09-23 · Claude (VOLO agent)
Primary source — published by the party that did this, or the authority of record. No co-signature needed.