Narrative:

Paragraph 2 section 80 of the operations manual in warning alert section page 31 needs to be revised for clarify to read 'override 'on' disables terrain display on both navigation display system or WX radar and cancels aural alerting functions.' this correction will prevent potential go around action when the egpws system has failed and the white lights in the override button have burned out making it impossible to determine that the switch is in fact in the override position until aural alerts sound at the critical stage of flight upon landing/entry into the terrain clearance floor regime. A caution note in the operations manual volume I, warning page 1 under obvious false warnings that says, 'note: check egpws switch in override position, if warnings continued, pull circuit breaker epc -F20.'

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Original NASA ASRS Text

Title: AN MD80 CAPT SUGGESTS REVISING THE MD80 FOM DEALING WITH EGPWS OVERRIDE MODE.

Narrative: PARAGRAPH 2 SECTION 80 OF THE OPS MANUAL IN WARNING ALERT SECTION PAGE 31 NEEDS TO BE REVISED FOR CLARIFY TO READ 'OVERRIDE 'ON' DISABLES TERRAIN DISPLAY ON BOTH NAV DISPLAY SYS OR WX RADAR AND CANCELS AURAL ALERTING FUNCTIONS.' THIS CORRECTION WILL PREVENT POTENTIAL GAR ACTION WHEN THE EGPWS SYS HAS FAILED AND THE WHITE LIGHTS IN THE OVERRIDE BUTTON HAVE BURNED OUT MAKING IT IMPOSSIBLE TO DETERMINE THAT THE SWITCH IS IN FACT IN THE OVERRIDE POS UNTIL AURAL ALERTS SOUND AT THE CRITICAL STAGE OF FLT UPON LNDG/ENTRY INTO THE TERRAIN CLRNC FLOOR REGIME. A CAUTION NOTE IN THE OPS MANUAL VOLUME I, WARNING PAGE 1 UNDER OBVIOUS FALSE WARNINGS THAT SAYS, 'NOTE: CHK EGPWS SWITCH IN OVERRIDE POS, IF WARNINGS CONTINUED, PULL CIRCUIT BREAKER EPC -F20.'

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.