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SECTION 1
Introduction
Why RAAS?
060-4241-000 • Rev. E - December 2003
MK V & MK VII EGPWS Pilot Guide 59
The purpose of the Honeywell RAAS is to provide the flight crew
with supplemental information of aircraft position relative to runways
during surface operations and on final approach. RAAS is
an aural-only advisory function, and therefore, a visual display of
the information is not provided. RAAS provides timely aural advisory
messages to the flight crew in a significant number of
scenarios that have led to runway incursions. It should be
noted that RAAS is not intended for navigation purposes, e.g., to
guide an aircraft in or around the terminal area.
RAAS is integrated with the EGPWS. EGPWS protection and operation
is unaltered by the addition of RAAS. Note that RAAS
advisories have a lower priority than any EGPWS terrain-related
alerts, including radio altitude call-outs.
The RAAS uses aircraft inputs within the EGPWS such as GPS position,
heading, groundspeed and a runway database to generate
the ten aural advisories shown in the tables below. Note that GPS
availability is a requirement for the operation of RAAS. Aircraft
position is referenced to the GPS antenna position. RAAS does not
have knowledge of taxiways, Automatic Terminal Information Service
(ATIS) & Notice to Airmen (NOTAM) information, other
traffic, pilot intent, ATC clearance, ground markings and signage.
Crews should be cognizant of the prevailing ATIS and any
NOTAMs. RAAS operates automatically, without any action required
from the flight crew.
What is the
RAAS?
How Does
RAAS Work?
Summary of Routine Advisories
Routine Advisory Purpose
Approaching Runway - On Ground Awareness of a runway being approached by the aircraft during ground operations
(e.g., "Approaching one-one").
On Runway Awareness of which runway the aircraft is lined-up with during ground operations
(e.g., "On runway three-four left").
Approaching Runway - In Air Awareness of which runway the aircraft is tracking on final approach (e.g.,
"Approaching one-six right").
Landing Distance Remaining Awareness of aircraft position relative to the runway end (e.g., "One-thousand
remaining").
Runway End Awareness of the position of the aircraft relative to the runway end (e.g., "Onehundred
remaining").
060-4241-000 • Rev. E - December 2003
60 MK V & MK VII EGPWS Pilot Guide
Summary of Non-Routine Advisories
How Does
RAAS Work?
Continued
Note that during normal operations, the crew would only be exposed
to the five routine advisories for the entire period between
push-back at the departure airport and taxi-in at the destination
airport. The five advisories alone have the potential to address
many classic runway incursion scenarios.
RAAS advisories are heard over the same aircraft audio systems
that presently provide EGPWS audio caution and warning alerts in
the flight deck. The volume of RAAS messages is controlled by the
EGPWS and the RAAS message volume level is based on the expected
flight operation for each advisory.
As mentioned above, RAAS operates automatically, without any
action required from the flight crew. The EGPWS circuit-breaker
disables all EGPWS functionality including RAAS. The EGPWS Self-
Test push-button (if available) allows the crew to verify the
operational availability of all EGPWS functions, including the
RAAS. An optional RAAS Audio Inhibit Switch may be installed. A
single push of the Audio Inhibit Switch inhibits all RAAS advisories.
De-pressing the switch reactivates all RAAS advisories.
It is important to note that some RAAS features are optional and
may not be active in a given installation. Therefore you will need
to check the options selected by your company. Refer to an applicable
Airplane Flight Manual (AFM) or EGPWS Airplane Flight
Manual Supplement (AFMS) for details. Alternatively contact
Honeywell for assistance.
Non-Routine Advisory Purpose
Taxiway Take-off Awareness of excessive taxi speeds or a take-off on a taxiway ("On taxiway! On
taxiway!").
Insufficient Runway Length - On-
Ground
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
(e.g., "On runway three-four left, six-hundred remaining").
Extended Holding on Runway Awareness of an extended holding period on the runway (e.g., "On runway
three-four left, on runway three-four left").
Distance Remaining - Rejected
　
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