In Aviation, the HASELL check is a standard mnemonic for performing a series of checks prior to carrying out many types of manoeuvres, such as a Spin, Spiral Dive, Steep Turn or aerobatics.
HASELL is an acronym for:
- Height - sufficient to recover above 3000ft AGL
- Airframe - rated for the manoeuvre, flaps and landing gear as required, trimmed.
- Security - hatches and harnesses secure, no loose items in cockpit, gyros caged.
- Engine - running normally, fuel sufficient for manoeuvre, no carb icing.
- Location - clear of cloud, controlled airspace, airfields, built-up areas, other aircraft.
- Look Out - inspection turn to make sure area is clear around and below.