Inadvertent entry into IMC is a situation where pilots lose visual contact with the ground due to deteriorating meteorological conditions.
To prevent spatial disorientation, loss of control or controlled flight into terrain, pilots should slow the helicopter to a speed that provides a controlled deceleration in the distance equal to the forward visibility. The pilot should look for terrain that provides sufficient contrast to either continue the flight or to make a precautionary landing.
To admit the entry to the IMC conditions is the most important part of the management. The most common mistake which hinders a successful transition is trying to descend to re-establish VFR conditions.
An unplanned transition from VMC to IMC flight is an emergency situation that involves a different set of pilot actions. It requires the use of different navigation and operational procedures, interaction with ATC, and crew member resource management.
Firstly use the wings on the attitude indicator to level the helicopter. Maintain heading and increase to climb power. Establish climb airspeed at the best angle of climb but no slower than VMINI.
Climb straight ahead until your crosscheck is established. Then, make a turn only to avoid terrain or objects. If an altitude has not been previously established with ATC to climb to for inadvertent IMC, then, you should climb to an altitude that is at least 1,000 feet above the highest known object and that enables to maintain two-way communications with ATC services.
Attempt to contact ATC as soon as the helicopter is stabilized in the climb and headed away from danger.
Initial transmission should include;
- Your approximate location, that inadvertent IMC has been encountered and an emergency climb has been made.
- Your altitude.
- Amount of flight time remaining (fuel state)
- Number of persons on board.
After the emergency climb is completed, you may either request vectors to a place where VFR conditions exist or to the nearest suitable airport/heliport for an instrument approach.
- VID 522050 - Creation
DATE OF SUBMISSION
- 12:38, 23 February 2021
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