EASA Part-66 Module12 helicopter systems foundations common mistakes
EASA Part-66 Module12 helicopter systems foundations · Understand the traps and how to avoid them.
Using left and right without declaring rotation direction.
The aerodynamic reference is missing.
What to do instead
State the viewing convention and actual rotor direction before applying a directional rule.
Calling every rotor response exactly ninety degrees.
A simplified dynamic model is universalized.
What to do instead
Use the actual rotor design and defined control-phase convention.
Assuming a hydraulic jam is always manually overridable.
A particular safety architecture is assumed without evidence.
What to do instead
Use the actual control-system description and approved failure procedure.
Treating NOTAR as a hot engine-bleed jet.
The anti-torque airflow source and mechanism are misidentified.
What to do instead
Distinguish the actual fan/circulation-control arrangement from a generic bleed-air system.
Assuming a crossfeed valve connects every tank to every engine.
A system name replaces its actual piping diagram.
What to do instead
Trace the specified feed and transfer paths and their limits.
Disconnecting a hydraulic part because the pump is off.
Stored energy is ignored.
What to do instead
Establish the actual isolation and depressurization state under approved procedures.
Adding rotor balance weights from a frequency label alone.
A diagnostic clue becomes an unapproved correction.
What to do instead
Use the defined measurements, allowable locations and maintenance procedure.
Treating no chip warning as proof that the gearbox is fault-free.
Detection limitations and complementary evidence are ignored.
What to do instead
Assess the relevant oil, vibration, usage and inspection evidence together.