CIVIL AVIATION REQUIREMENTS SECTION 2
SERIES ‘I’ PART VII 28TH MAY 1999
3.2 All turbine-engined aeroplanes of a maximum certificated take-off mass in excess
of 15 000 kg or authorized to carry more than 30 passengers shall be equipped
with a ground proximity warning system which has a forward looking terrain
avoidance function.
3.3 All turbine-engined aeroplanes of a maximum certificated take-off mass in excess
of 5700 kg or authorized to carry more than nine passengers, for which the
individual certificate of airworthiness is first issued on or after 1 January 2004,
shall be equipped with a ground proximity warning system which has a forward
looking terrain avoidance function.
3.4 All turbine-engined aeroplanes of a maximum certificated take-off mass in excess
of 5 700 kg or authorized to carry more than nine passengers shall be equipped
with a ground proximity warning system which has a forward-looking terrain
avoidance function.
3.5 All turbine-engined aeroplanes of a maximum certificated take-off mass of 5 700
kg or less and authorized to carry more than five but not more than nine
passengers should be equipped with a ground proximity warning system which
provides the warnings as para 4.1 a) and c), warning of unsafe terrain clearance
and a forward looking terrain avoidance function.
3.6 All piston-engined aeroplanes of a maximum certificated take-off mass in excess
of 5 700 kg or authorized to carry more than nine passengers shall be equipped
with a ground proximity warning system which provides the warnings in para 4.1
a) and c), warning of unsafe terrain clearance and a forward-looking terrain
avoidance function.
3.7 A ground proximity warning system shall provide automatically a timely and
distinctive warning to the flight crew when the aeroplane is in potentially
hazardous proximity to the earth’s surface.
Note: The forward looking terrain avoidance warning equipment is commonly known Enhanced
Ground Proximity Warning System (EGPWS) or Ground Collision Avoidance System
(GCAS).
4 OPERATIONAL REQUIREMENTS
4.1 A ground proximity warning system shall provide, unless otherwise specified
herein, warnings under the following circumstances :
a) excessive descent rate;
b) excessive terrain closure rate;
c) excessive altitude loss after take-off or go-around;
d) unsafe terrain clearance while not in landing configuration
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CIVIL AVIATION REQUIREMENTS SECTION 2
SERIES ‘I’ PART VII 28TH MAY 1999
i) gear not locked down;
ii) flap not in landing position; and
e) excessive descent below the instrument glide path.
4.2 Prior to operation of the aeroplane fitted with GPWS as required by para 3, the
aeroplane flight manual shall contain appropriate procedures for-
a) the use of GPWS equipment;
b) amendment to the checklist to include GPWS;
c) flight crew action with respect to the warnings provided by GPWS
equipment;
d) de-activation for planned abnormal and emergency conditions;
e) inhibition of mode 4 warnings based on flap being in other than the landing
configuration if the system incorporates a mode 4 flap warning inhibition
control.
4.3 Deactivation of GPWS can only be in accordance with the procedures
contained in the aeroplane flight manual.
4.4 Whenever GPWS is de-activated, an entry shall be made in the aeroplane
maintenance record that includes the date and time of the de-activation and the
deactivation properly placarded in the cockpit.
5. The operators are encouraged that in addition to the warning modes given in
para 4.1, the following modes may also be provided for the purpose of enhanced
safety of flight operations:
5.1 Forward-looking wind shear warning system - jet aeroplanes All turbo-jet
aeroplanes of a maximum certificated take-off mass in excess of 5 700 kg or
authorized to carry more than nine passengers may be equipped with a forward-
looking wind shear warning system. A forward-looking wind shear warning
system should be capable of providing the pilot with a timely aural and visual
warning of wind shear ahead of the aircraft, and the information required to
permit the pilot to safely commence and continue a missed approach or go-
around or to execute an escape manoeuvre, if necessary. The system should
also provide an indication to the pilot when the limits specified for the
certification of automatic landing equipment are being approached, when such
equipment is in use.
5.2 Altitude call-out and excessive bank angle alert.
6. GENERAL REQUIREMENTS
6.1 The GPWS shall be of an approved type and meet the specifications given in
the FAA TSO C-92 C or any other specification acceptable to DGCA. In case
of EGPWS and GCAS they should meet the specifications given in FAA TSO-
C151a or JAA JTSO C151a or any other specifications acceptable to DGCA.
The Forward looking Wind shear Warning Systems should meet the
requirements given in FAA TSO-C117a or any specifications acceptable to
DGCA.
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