What should be ensured regarding helicopter speed before entering IMC during take-off, and what is the lowest permissible speed in that condition?

Sufficient control of the helicopter in IMC must be ensured by keeping the speed before entering IMC above the minimum authorised speed in IMC (Vmini). The lowest speed before entering IMC is the higher of Vtoss (velocity take-off safety speed) and Vmini.

In the example given in GM4 SPO.OP.110, if Vtoss is 45 kt and Vmini is 60 kt, how must the take-off minima be adjusted?

The take-off minima must include the distance to accelerate to 60 kt, and the take-off distance should be increased accordingly.

According to GM4 SPO.OP.110, what is the nature of Vmini and how does it relate to the AFM?

Vmini is the minimum authorised speed in IMC and is a limitation in the AFM (Aeroplane Flight Manual).

GM4 SPO.OP.110 Aerodrome operating minima - aeroplanes and helicopters

Q: For operations with complex helicopters, what two speeds are compared to determine the lowest speed before entering IMC?

The lowest speed before entering IMC is the highest of Vtoss (velocity take-off safety speed) and Vmini (minimum authorised speed in IMC).

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GM4 SPO.OP.110 Aerodrome operating minima – aeroplanes and helicopters

ED Decision 2014/018/R

TAKE-OFF MINIMA — OPERATIONS WITH COMPLEX HELICOPTERS

(a) To ensure sufficient control of the helicopter in IMC, the speed, before entering in IMC, should be above the minimum authorised speed in IMC, V_mini. This is a limitation in the AFM. Therefore, the lowest speed before entering in IMC is the highest of V_toss (velocity take-off safety speed) and V_mini.

(b) As example, V_toss is 45 kt and V_mini 60 kt. In that case, the take–off minima have to include the distance to accelerate to 60 kt. The take-off distance should be increased accordingly.

Details

Source-Title: GM4 SPO.OP.110 Aerodrome operating minima - aeroplanes and helicopters View latest amendments

Erulesid: ERULES-1963177438-13855 Compare versions

Domain: Air operations

Applicabilitydate: 1 July, 2014

Entryintoforcedate: 1 July, 2014

Regulatorysource: ED Decision 2014/018/R Navigate

Regulatorysubject: Part-SPO

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: SPO.OP.110 Aerodrome operating minima -- aeroplanes and helicopters

Origin: EASA

Category: EAR