曝光台 注意防骗
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Extended Holding On Runway
Safety data show that 17% of runway incursions involved the poor
use of a line-up-and-wait clearance (or a taxi-into-position-andhold
clearance [TIPH]). The typical scenario involved Tower ATC
clearing an aircraft into position-and-hold on to the departure
runway. Factors such as distractions in the Tower, handling multiple
frequencies, high workload and memory lapses have
resulted in the tower controller simultaneously clearing other
traffic to land on the occupied runway. In some cases crews issued
with the TIPH clearance were holding-in-position for an
unusually extended period. Industry safety recommendations
suggest that flight crews holding-in-position on an active runway
for an unexpected extended period should contact tower to confirm
the extended holding clearance. Timely crew intervention
could potentially reduce the risk of a runway incursion.
The purpose of the Extended Holding On Runway Advisory is to
provide crew awareness of an extended holding period on the
runway.
The aural advisory is given if the following criteria are met:
• aircraft enters a runway; and
• aircraft remains in position for a time period considered to be
an extended holding period.
Your company will select the extended holding period and it cannot
be changed by the flight crew. The time period can be
configured for 60, 90, 120, 180, 240, or 300 seconds.
The aircraft heading must be within 20 degrees of runway heading
and the aircraft must not move more than 100 ft along the
runway for this advisory to be activated.
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 77
Runway Entry
and Occupancy
Continued
Note that if the aircraft continues to hold for a period in excess of
the (initial) extended holding period, the advisory may be set to
repeat for the same (or different) holding interval. The repeat
advisory time may also be configured to be off. These options are
selected by your company and cannot be changed by the flight
crew.
The Extended Holding On Runway Advisory is suppressed after a
Rejected Take-Off (RTO). The advisory is reset and available
again once the aircraft exits the current runway.
After the specified extended holding period has elapsed, RAAS
provides an aural message that is a double repetition of the On
Runway Advisory. For example, if an aircraft has been holding-inposition
on runway 34 left for an extended period (e.g.,
90 seconds), the system will annunciate “On runway three-four
left, on runway three-four left.”
"On Runway Three-Four Left,
On Runway Three-Four Left"
34L 16R
A9 A6
A7
A5 A4 A3 A2 A1
A A
B
11
29
34R 16L
G1 G2 G3 G4 G5 G6
G
D
D1
D2
D3
D4
A8
Example of Extended Holding On Runway Advisory
060-4241-000 • Rev. E - December 2003
78 MK V & MK VII EGPWS Pilot Guide
The advisory is generated if the following conditions are satisfied:
• aircraft is on the last half of the runway;
• groundspeed is greater than 40 knots; and
• an RTO is initiated (RTO status is assumed if groundspeed
during the take-off roll decreases by 7 knots from the maximum
value achieved).
The advisory terminates once the groundspeed decreases below
40 knots during the RTO. The Extended Holding On Runway Advisory
is not provided during the period following the RTO.
The advisories are generated at whole thousand-foot intervals if
RAAS is configured in “feet”, except that the last possible advisory
occurs at 500 feet. For example, the following advisories would
be generated during a RTO on a 9000-foot runway:
• “Four-thousand remaining”;
• “Three-thousand remaining”;
• “Two-thousand remaining”;
• “One-thousand remaining”; and
• “Five-hundred remaining”.
Distance Remaining - Rejected Take-Off Advisory
The purpose of the Rejected Take-Off Distance Remaining Advisory
is to provide the flight crew with position awareness
information during a RTO.
Rejected
Take-Off
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 79
Rejected
Take-Off
Continued
The metric distance advisories are generated at 300-metre intervals,
except that the last possible advisory occurs at 100 metres.
For example, the following advisories would be provided during
a RTO on a 3000-metre runway:
• “One-thousand-two-hundred remaining”;
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