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where the aircraft is on the runway. The advisory is presented
once each time the aircraft enters a runway.
"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 On Runway Advisory
060-4241-000 • Rev. E - December 2003
74 MK V & MK VII EGPWS Pilot Guide
Runway Entry
and Occupancy
Continued
Insufficient Runway Length - On-Ground Advisory
Safety data indicate that loss of situational awareness on the airport
surface resulted in 12% of all take-offs being conducted
from the incorrect runway. In some of those cases the take-off
distance available was less than that required. Data also indicates
that 24% of runway incursion take-offs involved an intersection
departure. While not as common, there have been instances
where crews have turned the wrong direction while lining-up on
a runway for an intersection departure (i.e. heading error of
180°). This situation not only creates a conflict with any aircraft
on short-final, but the runway distance available may be insufficient
for a safe take-off.
The purpose of the Insufficient Runway Length - On-Ground Advisory
is to provide the crew with awareness of which runway the
aircraft is lined-up with, and that the runway length available for
takeoff is less than a defined nominal take-off runway length. The
“nominal” runway distance for take-off is aircraft type specific
and is set by an operator. Note: it cannot be changed by the flight
crew.
This advisory is provided when the following conditions are met:
• all conditions for a routine On-Runway Advisory are satisfied;
and
• available distance for takeoff is less than the defined nominal
runway length.
This advisory does not take into account prevailing conditions
such as aircraft weight, wind, runway condition & slope, air temperature
and altitude of airport. If the operator does not specify
the nominal runway length, the advisory is defaulted to off, unless
the operator has chosen to always advise the runway length available
for takeoff.
RAAS does not account for operational data such as NOTAMs that
refer to areas of runway that are not available (e.g. due construction,
snow removal, etc). Crews should be cognizant of any
NOTAMs and other published restrictions in effect.
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 75
Runway Entry
and Occupancy
Continued
The routine “On runway” message advisory is appended by runway
length remaining in either feet or metres, e.g., “On runway
three-four-left, two-thousand remaining”. The "remaining" element
of the message refers to the runway distance remaining in
the EGPWS database to the nearest 100 feet (or 100 metres for a
metric option). Note that the unit (feet or metres) is not annunciated.
The unit of length used by RAAS can be confirmed by
performing an EGPWS self-test (See “Operational Availability”
section).
Dissimilar references to the runway heading during the Approaching
Runway and the On Runway advisories are a cue to a
potentially unusual situation. In this example assume that the aircraft
is cleared for an intersection departure at Alpha 2 for
runway 16R. The "Approaching-one-six right" advisory is provided
as the aircraft approaches the runway at Alpha 2. However,
an inadvertent turn on to runway 34L (as opposed to 16R) implies
that runway identifier for the Insufficient Runway Length
Advisory is runway "34L". If the crew correctly turns onto runway
16R, the runway identifier for the routine On Runway Advisory is
"16R". Note that a third reference to the "intended" runway for
departure, in this example, is a clearance for take-off from runway
"16R" from ATC. During a back-taxi scenario, the Insufficient
Runway Length Advisory would aid as a confirmation of pilot intent
to back-taxi.
"On Runway Three-Four Left,
Six-Hundred Remaining"
34L 16R
A9 A6
A7
A5 A4 A3 A2 A1
A A
B
11
29
34R 16L
G5 G4 G3 G2 G1
G6
G
D
D1
D2
D3
D4
A8
Example in metres
Example of Insufficient Runway Length - On-Ground
Advisory in Units of Metres
060-4241-000 • Rev. E - December 2003
76 MK V & MK VII EGPWS Pilot Guide
Runway Entry
and Occupancy
Continued
　
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