General
Maximum distance and altitude separation from noise-sensitive areas are the most effective means of noise abatement.

Control movement should be gradual and smooth.

Noise exposure is:

• lower on the left side than on the right side of the helicopter,
• lower to the sides of the flight path than directly underneath, and
• lower upwind than downwind of the helicopter. 

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Ground Operations

No Available Information.

Hover Hover-Taxi Ground Taxi

No Available Information

Takeoff and Climb

After departing translational lift, climb at 55 knots instead of the recommended normal procedure of Vy.

Enroute and Cruise Flyover

When crossing noise-sensitive areas, limit airspeed to 133 knots.
Plan routes to keep noise-sensitive areas on the left side of the helicopter. If such areas are on the right of the aircraft, do not approach within 500 meters.
Where possible, maintain a minimum altitude of 1,000 feet above ground level
 

Turns

No Available Information

Descent/Approach and Landing

The speed of approach should be just under 45 knots during the entire descent.
Plan the approach and landing to keep noise-sensitive areas to the left of the helicopter.
Avoid descending directly over noise-sensitive areas.
 

Comments

The speed of takeoff and approach are different from those for standard procedures. They are not optimal for complications such as emergency engine failure, and do not comply with Category A flight procedures. In particular, the takeoff speed of 55 knots is recommended only for noise abatement. Pilots are expected to take into account gross weight and environmental conditions, and to use their judgment when applying this noise abatement procedure.

HAI Comment

The minimum enroute and cruise flyover height information given is less than that recommended by HAI in the 'Fly High Chart' which suggests, when practical, a minimum height in the order of 2000ft for the AS365N.