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in a position to comply with 3.2.7.2.1. The helicopter shall be
able, in the even1 of the critical power-unit becoming
inoperative at any time after reaching a defined point after
take-off. lo continue the take-off and initial climb and clear all
obstacles along its flight path by an adequate margin until it is
in a position to comply wit11 3.2.7.2.1. Before the defined
point, failure of a critical power-unit may cause the helicopter
to force, land. therefore the conditions stated in 3.1.2 shall
apply before the defined point.
3.2.7.1.3 For perfclrnzanc~ Class 3 helicopters. Thc helicopter
shall be able, with all engines operating, to clear all
obslacles along its flight path by an adequate margin until it is
in a position to comply with 3.2.7.2.2. At any pojnt of the
tlight path, failure of a power-unit will cause the helicopter
lo force land, therefore the conditions stated in 3.1.2 shall
apply-
3.2.7.2 En-route phase
3,2.7.2.1 For pe$orrnance Class I and Class 2 helicopters.
The helicoprcr shall be able, in the event of the critical
power-unit becoming inoperative at any point in the en-route
phase, to continue thc flight to an operating site at which the
Standard of 3.2.7.3.1 for Class 1 helicopters, or the Standard
of 3.2.7.3.2 for Class 2 helicopters can be met. without flying
below the appropriate minimum flight altitude at any point. In
he case of helicopters having three or more power-units, on
any part of the route where the location of suitable intermediate
operating sites and the total duration of the flight are
such that the probability of a second power-unit becoming
inoperative must be allowed for if the general level of safety
implied by the Standard of this chapter is to be maintained, the
helicopter shall be able, in the event of any two power-units
becoming inoperative, to continue the tlight to a suitable
operating site and make a landing thercat.
3.2.7.2.2 For petj5ormance Class 3 helicopters. The helicopter
shall be able, with all power-units operating, to
continue along its intended route or planned diversions without
flying at any point below the appropriate minimum flight
altitude. At any point of the t-light path, failure of a power-unit
will cause the helicopler to force land, therefore the conditions
stated in 3.1.2 shall apply.
3.2.7.3 Approach and landing phase
3.2.7.3.1 For pe@ormance Cluss 1 helicopters. In the
event of the critical power-unit becoming inoperative at any
point during the approach and landing phase, before the
landing decision point, the helicopter shall, at the destination
and at any alternate, after clearing all obstacles in the approach
path by a safe margin, be able to land and stop within the
landing distance available or to perfonn a balked landing and
clear all obstacles in the flight path by an adequate margin
equivalent to that specified in 3.2.7.1.1. In case of the failure
occurring after the landing decision point, the helicopter shall
be able to land <and stop within the landing distance available.
3.2.7.3.2 For perjorrnance Class 2 helicopters. Wit11 all
engines operating, the helicopter shall, at the destination and at
ally alternate, after clearing all obstacles in the approach path
by a safe margin, be able either to land and stop within the
landing distance availablc or to pcrlbml a balked landing and
clear all obstacles in the tlight path by an adequate margin
equivalent to that specified in 3.2.7.1.2. In the event of the
critical power-unit becoming inoperative before the defined
point beibrc landing, the same specifications are applicable.
After the defined p i n t . failure of a power-unit may cause the
helicopter to force land. therefore the conditioils stated in 3.1.2
shall apply.
3.2.7.3.3 For performance Class 3 helicopters. With all
engines operating, the helicopter shall, at the destination and at
any alternate, after clearing all obstacles in the approach path
by a safe margin, be able to land and stop within the landing
distance available or to perfonn a balked landing and clear all
obstacles in the flight path by an adequate margin equivalent
to that. specified in 3.2.7.1.3. At any point of the flight path,
failure of a power-unit will cause the helicopter to force land.
therefore the conditions stated in 3.1.2 shall apply.
Note.- "An adequate margin" referred to in rhese
provisions, and applicable to all yerfomzance chsses, is
iElustrnted by the examples illeluded in Attachnient A to this
Anne.~.
Section 11, Chapter 3 Annex 6 - Operation of Aircraft
3.3 Obstacle data Note.- See Antzex 4 and Annex- 15 for rnetltods of
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