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Crew Incapacitation
From SKYbrary Wiki
| Article Information | ||
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| Category: | Human Behaviour | 
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| Content source: | SKYbrary | 
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| Content control: | EUROCONTROL | 
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Contents |
Definition
Flight Crew Incapacitation is a term used to describe the inability of a member of a flight crew to carry out their normal duties because of the onset during flight of the effects of physiological factors.
Description
Incapacitation may occur as a result of:
- The effects of Hypoxia (insufficient oxygen) associated with an absence of normal pressurisation system function at altitudes above 10,000 ft.
- Smoke or Fumes associated with an In-Flight Fire or with contamination of the air conditioning system.
- Food Poisoning.
- Being asleep.
- A medical condition such as a heart attack, stroke or seizure or transient mental abnormality.
- A malicious or hostile act such as assault by an unruly passenger, terrorist action or small arms fire, or lasers.
In the multi crew case, incapacitation may be obvious immediately, become progressively evident, or escape notice altogether until an unexpected absence of response or action occurs.
Effects
Naturally if both pilots of a multi crew aircraft, or the single pilot in the case of a small aicraft, become incapacitated then the safety of the flight is liable to be severely compromised and Loss of Control may result. A subtle incapacitation of one of two pilots may present a similar risk, especially at low level and particularly if it occurs during a precision approach in Low Visibility Procedures.
Loss of Separation may be a secondary effect of of total crew incapacitation or side effect of the additional workload imposed upon the remaining crew member(s).
Solutions
The key to avoiding serious problems from the incapacitation of one pilot in a multi crew aircraft is the availability of appropriate SOPs and recurrent training which encourages their use if necessary.
Correct use of both the aircraft pressurisation system and, if necessary, emergency oxygen supplies will both prevent Hypoxia and protect the crew from the effects of Smoke and Fumes. Therapeutic Oxygen supplies can also alleviate the condition of a crew member or passenger suffering a medical condition. Staggering crew meal times and ensuring that each pilot eats different meals both prior to and during flight, will reduce the chance of both pilots becoming incapacitated due to Food Poisoning. Intentional sleep whilst on the flight deck may be relevant on long haul flights but can only take place if an appropriate SOP exists and is applied.
The first indication that a controller might get of total flight crew incapacitation is Loss of Communication. Having tried all means to contact the aircraft, without radio contact it is extremely difficult for a controller to ascertain what is happening on an aircraft. If the aircraft’s autopilot is engaged then it will likely follow the flight plan route to destination. Conforming with standard loss of communication procedures, military aircraft can be tasked to intercept the aircraft and inspect it visually but there is little that a controller can do other then ensure the safety of surrounding traffic by maintaining separation.
Related Articles
- Emergency Depressurisation
- Fire in the Air
- Accident and Serious Incident Reports: Crew Incapacitation
- Laser Safety in Navigable Airspace
- Food Poisoning (OGHFA SE)
Accidents & Incidents
Events on the SKYbrary Database which list Incapacitation as a causal factor:
- BE20, vicinity North Caicos British West Indies, 2007 (LOC HF) (On 6 February 2007, a Beech 200C Super King Air being operated by a small locally-based airline on a passenger flight from North Caicos to Grand Turk, Turks and Caicos Islands, British West Indies crashed into a shallow lagoon 1nm south east of the departure airport soon after a dark night take off in VMC. The single pilot was fatally injured as a result of the accident whilst four out of the five passengers received serious injuries and the other, seated at the back of the aircraft, received only minor injuries.)
- DH8D, vicinity Medford OR USA, 2003 (BS AW HF LOC) (On 8 January 2003, a DHC8-400 sustained multiple bird strikes during a night visual circuit at the Medford airport, OR, USA, resulting in loss of flight displays, multiple false system warnings and the shattering of the LH windscreen. The Captain sustained significant facial injuries and temporary incapacitation with a successful approach and landing being completed by the co-pilot.)
- B763, en-route, Atlantic Ocean, 2008 (HF) (On 28 January 2008, the first officer on a B767, flying from Toronto to London, became incapacitated and the captain elected to divert to the nearest airport, Shannon, Ireland.)
- B738, En route, south west of Beirut Lebanon, 2010 (LOC HF) (On 25 January 2010, a Boeing 737-800 being operated by Ethiopian Airlines on a scheduled passenger flight from Beirut to Addis Ababa in night IMC disappeared from ATC radar soon after departure from Runway 21 and was subsequently found to have impacted the sea in an unintentional out of control condition some five miles south west of the airport less than five minutes after getting airborne Impact resulted in the destruction of the aircraft and the death of all 90 occupants.)
- LJ35, Aberdeen SD USA, 1999 (HF) (On 25 October 1999, a Learjet 35, being operated on a passenger charter flight by Sunjet Aviation, crashed in South Dakota following loss of control attributed to crew incapacitation.)
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