In aviation, in the UK, New Zealand and elsewhere, HASELL is a standard mnemonic to prompt 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
• 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.

Can be shortened to HELL and should be repeated every few minutes if several figures are going to be flown.

See also

• BUMPH

Aviation terminology