Helicopter Class 1 Cat A Extension

Helicopter Performance
Performance Class 1 Category A Extension
(no requirement to reject)
• Development of more powerful light and medium twins has resulted
ed
(in 2005) in a situation where One Engine Inoperative (OEI) Hover r out
of Ground Effect (HOGE) is possible at MGW/MCTOM.
• This effectively removes the need to re-land if an engine fails early in
the take-off or late in the landing manoeuvre thus breaking the link
between PC1 and the Category A procedure (which has as an
element the limitation on the size the heliport/helideck
helideck).
• From TDP obstacle clearance still has to be shown - the Category A
profile has therefore to be the basis of the procedure.
MGM = Max. Gross Weight; MCTOM ? Max. Calculated Take-Off Mass

Helicopter Performance
Performance Class 1 Category A Extension
(no requirement to reject)
TDP 30 ft - X
TDP 30 ft
Min dip -- X
Min dip
TDP = Take-Off Decission Point

Helicopter Performance
Performance Class 1 Category A Extensions
(adequate visual cues)
These extensions are only available with the vertical or back-up procedure
There is sometimes a penalty when an elevated procedure (with the e same
profile as a ground level helipad-procedure) procedure) is certificated - the reject
surface is required to be greater because of the reduction of visual cues.
A heliport is considered to be elevated when 3m above the surrounding
area; clearly if a specific elevated heliport has a rich visual cue
environment, discretion could be applied by the Authority.
There is no additional requirement for power reserves if this
judgement is exercised.

Helicopter Performance –
Performance Class 1
Category A Extension Procedure
Vertical
take-off
and
landing
Elevated at 30 m
Elevated surface requirements
Elevated at 3 m
Ground level Heliport
Elevated surface requirements
Ground level surface requirements

Any Questions?