@Lyman:
Since english is not my native tongue, I have to use:
SIMPLIFIED TECHNICAL ENGLISH
Specification ASD-STE100
European Community Trade Mark No. 004901195
International specification
for the preparation of maintenance documentation in a controlled language.
EXTENSION (n): 1. The “action” when something extends
Approved Example: MAKE SURE THAT THE EXTENSION OF THE AIRBRAKES IS SMOOTH.
DEPLOY (v),
DEPLOYS,
DEPLOYED,
DEPLOYED: To move into a position of operation from a position of storage
NOTE: Use for thrust reverser or drogue chute operations only.
For other meanings, USE: EXTEND, RELEASE
Approved example: KEEP PERSONNEL AWAY FROM THE AIRCRAFT WHEN THE THRUST REVERSER DEPLOYS.
Evidence is in the FDR spoiler traces!