Reference Library

Condition of conformity to the applicable approved design and safe operating condition as determined by the authorized process.

Scheduling or operational indication of whether an aircraft may be available; not itself maintenance release.

Force used to oppose the torque reaction of a conventional single-main-rotor helicopter.

Electronic systems used for functions such as communication, navigation and flight information.

A common electrical distribution connection that supplies multiple loads.

A NASA center aviation safety function; contact and responsibilities depend on center guidance.

An event that could have caused harm or loss but did not; official definitions and reporting requirements govern.

Helicopter control that changes the collective pitch setting of main rotor blades.

Maintaining accurate records of the equipment and approved changes installed on an aircraft.

Helicopter control that changes rotor-disk thrust orientation through cyclic blade-pitch changes.

Pressure altitude adjusted for nonstandard temperature; a useful measure related to air density.

A reported condition or performance that may not match the required or expected state.

Foreign object debris; may cause foreign object damage.

The required organizational monitoring and communication process for flight progress and status.

Distinct approvals under applicable mission and maintenance processes; who grants them varies.

Unwanted material or substances in fuel that can create system or engine problems.

A condition or situation with the potential to cause harm.

Human performance influences such as fatigue, workload, communications and assumptions.

Instrument flight rules; operation under applicable instrument rules and authorizations.

Rotating lifting and control system of a helicopter.

Process of documenting completion, changes and outstanding operational actions.

NASA Procedural Requirements, a type of NASA governing document.

Potential for loss or harm associated with a planned operation.

Aircraft engine and related systems that produce propulsion or mechanical drive power.

Air movement generated by the lifting rotor system, a potential ground hazard.

Systems intended to improve handling or stability characteristics, depending on installed design.

Rotor used on many conventional helicopters to counter main rotor torque and control yaw.

Mechanical system that adapts and transfers engine power to driven rotor components.

Transformer rectifier unit, equipment converting suitable AC electrical power to DC.

Gas turbine engine producing useful shaft output power.

Aircraft condition and restrictions confirmed from the approved current source rather than assumption.