Decelerometer CRFI reading

CRFI = average decelerometer reading of a runway (TC AIM AGA 1.1.3).

Decelerometer (TC AIM AIR 1.6.3):

• Vehicle-mounted. Measures decelerating force under braking.
• Graduated 0 to 1. 1 = theoretical maximum decelerating capability on dry surface.
• Reading 0.8 and above = braking coefficient expected on dry runway.

Test method (TC AIM AIR 1.6.3):

• Brakes applied at 300 m (1,000 ft) intervals along runway.
• Applied within 10 m (30 ft) either side of centreline.
• Readings averaged, reported as CRFI number.

Equipped aerodromes: listed in CFS under RWY DATA (TC AIM AGA 1.1.3).

Trap: 1 = theoretical dry maximum, not the dry-runway threshold; dry indication starts at 0.8.

Practice