A B757-200 between 400 ft and 1500 ft, captain's lower ehsi display went blank. Returned in 5 seconds, but map shift occurred showing incorrect position.

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Attributes
ACN	617028
Time
Date	200405
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	agl bound lower : 400 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude climbout : takeoff climbout : initial
Route In Use	departure sid : cowby
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 8500 flight time type : 1000
ASRS Report	617028
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 40 flight time total : 6500 flight time type : 800
ASRS Report	616854
Events
Anomaly	aircraft equipment problem : critical other spatial deviation non adherence : company policies
Independent Detector	aircraft equipment other aircraft equipment : ehsi other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

After gear retracted, captain's lower CRT went blank. After about 5 seconds, the screen reilluminated. A map shift occurred, showing an incorrect position for our departure fix. Las departure gave us heading for our RNAV fix. The navigation system reset in about 2 mins. The flight continued to dfw without incident. Maintenance in dfw detected large amounts of dust accumulation on the CRT connectors. The connectors were cleaned and the aircraft returned to las without incident. Supplemental information from acn 616854: I diverted my attention to the captain's problem instead of helping him navigation to our fix via heading select or calling departure for a radar vector. Maintenance detected large accumulations of dust on CRT connectors and near cooling fans which most likely lead to an overheated CRT and subsequent shutdown.

Original NASA ASRS Text

Title: A B757-200 BTWN 400 FT AND 1500 FT, CAPT'S LOWER EHSI DISPLAY WENT BLANK. RETURNED IN 5 SECONDS, BUT MAP SHIFT OCCURRED SHOWING INCORRECT POS.

Narrative: AFTER GEAR RETRACTED, CAPT'S LOWER CRT WENT BLANK. AFTER ABOUT 5 SECONDS, THE SCREEN REILLUMINATED. A MAP SHIFT OCCURRED, SHOWING AN INCORRECT POS FOR OUR DEP FIX. LAS DEP GAVE US HDG FOR OUR RNAV FIX. THE NAV SYS RESET IN ABOUT 2 MINS. THE FLT CONTINUED TO DFW WITHOUT INCIDENT. MAINT IN DFW DETECTED LARGE AMOUNTS OF DUST ACCUMULATION ON THE CRT CONNECTORS. THE CONNECTORS WERE CLEANED AND THE ACFT RETURNED TO LAS WITHOUT INCIDENT. SUPPLEMENTAL INFO FROM ACN 616854: I DIVERTED MY ATTN TO THE CAPT'S PROB INSTEAD OF HELPING HIM NAV TO OUR FIX VIA HDG SELECT OR CALLING DEP FOR A RADAR VECTOR. MAINT DETECTED LARGE ACCUMULATIONS OF DUST ON CRT CONNECTORS AND NEAR COOLING FANS WHICH MOST LIKELY LEAD TO AN OVERHEATED CRT AND SUBSEQUENT SHUTDOWN.

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.