Copyright . The Boeing Company. See title page for details.
August 1, 2003 15.20.13
Warning Systems -System Description 737 Operations Manual
Radio Altitude Based Alerts
AURAL ALERT VISUAL ALERT DESCRIPTION
PULL UP PULL UP on both attitude indicators Follows SINK RATE alert if descent rate becomes severe. Follows radio altitude based TERRAIN alert if excessive terrain closure rate continues and landing gear and/or flaps are not in landing configuration.
TERRAIN, TERRAIN PULL UP on both attitude indicators Excessive terrain closure rate.
DON’T SINK PULL UP on both attitude indicators Excessive altitude loss after takeoff or go–around.
GLIDE SLOPE BELOW G/S P–INHIBIT lights Deviation below glide slope. Volume and repetition rate increase as deviation increases. Pushing the ground proximity BELOW G/S P-INHIBIT light cancels or inhibits the alert below 1,000 feet RA.
SINK RATE PULL UP on both attitude indicators Excessive descent rate.
TOO LOW, FLAPS PULL UP on both attitude indicators Unsafe terrain clearance at low airspeed with flaps not in a normal landing position. Pushing the ground proximity flap override switch to FLAP INHIBIT inhibits the alert.
TOO LOW, GEAR PULL UP on both attitude indicators Unsafe terrain clearance at low airspeed with landing gear not down. Pushing the ground proximity gear override switch to GEAR INHIBIT inhibits the alert.
TOO LOW, TERRAIN PULL UP on both attitude indicators Unsafe terrain clearance at high airspeed with either landing gear not down or flaps not in landing position. Follows DON’T SINK if another descent is initiated after initial alert, before climbing to the altitude where the initial descent began.
Copyright . The Boeing Company. See title page for details.
15.20.14 August 1, 2003
Warning Systems -System Description 737 Operations Manual
Peaks Display Mode
As an enhancement to the current “standard” EGPWS terrain display, the Peaks Mode terrain display allows terrain below the aircraft to be viewed on the EGPWS terrain display during the cruise portion of flight. At altitudes safely above all terrain for the display range chosen the terrain is displayed independent of aircraft altitude emphasizing the highest and lowest elevations to provide increased situational awareness. This increased awareness can be particularly valuable to the flight crew in the event of an unplanned descent or off-route deviation and for the purpose of previewing terrain prior to descent.
The standard EGPWS terrain display uses colors and shading patterns corresponding to the vertical placement between terrain elevation and the current altitude of the aircraft. Terrain more than 2000 feet below the aircraft is not displayed and the terrain display is typically blank during the enroute portion of flight. The Peaks Mode Display adds additional density patterns and level thresholds based an terrain elevations relative to the range and distribution of terrain in the display area. The Peaks Mode display is thus a “merged” display applicable to all phases of flight.
With the new Peaks Mode display, two elevation numbers indicating the highest and lowest terrain currently being displayed are overlaid on the display. The elevation numbers indicate terrain in hundreds of feet above sea level (MSL). The terrain elevation numbers are displayed with the “highest” terrain number on top, and the “lowest” terrain number beneath it. The “highest” terrain number is shown in the same color as the highest terrain color pattern on the display, and the “lowest” terrain number is shown in the color of the lowest terrain color pattern shown on the display. A single elevation number is displayed when the screen is all black or blue as a result of flying over water or relatively flat terrain where there is no appreciable difference in terrain elevations. The elevation numbers on the display are an additional indication that the terrain display is selected.
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