CRM Knowledge Base
The theory behind the reflex.
Ten concepts. Read them before the scenarios. Return to them after the debrief.
Concepts · 09
Decision Making Under Pressure
What it is
Decision making under pressure describes the degradation of decision quality that occurs when time pressure, high stakes, and emotional load combine. Pilots are required to make consequential decisions in exactly these conditions. The decisions that matter most are the ones made when the environment is least conducive to making them well.
Why it happens
Pressure activates the stress response, which increases adrenaline and cortisol and shifts cognitive processing toward fast, pattern-matching thinking. This is useful for executing practiced procedures. It is not useful for novel situation assessment, multi-variable weighing, or reversing a committed course of action. Under high pressure, the brain strongly prefers familiar paths — including continuing to do what it has been doing.
In the cockpit
The weather is deteriorating. The fuel is tighter than you planned. Dispatch is on the radio. The captain is leaning toward continuing. There are four variables moving simultaneously and you have ninety seconds to form a view and state it clearly. In that moment, complexity feels like a reason to defer to someone else rather than a reason to slow down and think.
The counter-reflex
Pre-commit to decision rules before the pressure arrives. "If fuel drops below X with weather below Y, the decision is divert — I do not negotiate that in the air." Rules made on the ground before the sector are made by the prefrontal cortex. Rules made at 40nm in a hold are made by the stress response. One of these is better at weighing variables.
From the reports
Composite patterns from public EASA, AAIB, BEA, and NTSB occurrence data.
OCCURRENCE PATTERN
Approximately 35 minutes from destination, the crew received updated weather showing conditions rapidly approaching minima. Fuel state allowed for one approach and a diversion with legal reserves. Dispatch advised of a forecast improvement within 20 minutes. The crew elected to continue and hold. The improvement did not materialise within the forecast window. The subsequent diversion was conducted with minimum fuel. Post-event analysis: the crew had sufficient information at 35 minutes to make a diversion decision with full fuel margin. The decision was deferred three times in the holding pattern as conditions remained marginal but not definitively below limits.
Pattern composite — public occurrence database [BEA]
CRM finding: Decision Making — Diversion decision deferred under pressure