Air carrier medium large transport flight crew noticed during preflight the next morning after an ov...

Attributes
ACN	503550
Time
Date	200003
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mke.airport
State Reference	WI
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Controlling Facilities	tower : pvd.tower
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 6500 flight time type : 900
ASRS Report	503550
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Flew an aircraft with an improper ram air temperature/EPR gauge installer. On mar/xa/01, I flew an aircraft from mke to mci. Aircraft is a JT7 pwred aircraft. The previous crew had written up the ram air temperature/EPR gauge, had it removed and replaced, but maintenance installed a gauge that corresponds to the JT9 engine. This crew flew several legs and did not discover the problem. We received the aircraft on an aircraft change for our final night flight to mci. At night, it is almost impossible to tell what rating the ram air temperature/EPR gauge corresponds to, ie, -7 or -9. The markings on the gauge are covered by a switch. The only way is to know the gauge has different range of settings for a corresponding temperature. I did not notice the difference. This problem was discovered the next day when a captain questioned the setting the first officer had set in the EPR gauges for takeoff. To correct this problem, maintenance should xref the part number in the technical manuals to ensure the proper gauge is installed in the aircraft. In the future, I will be sure the proper gauge is installed for all flts by checking the markings on the gauge and xrefing the EPR's on the takeoff power setting (takeoff data).

Original NASA ASRS Text

Title: ACR MLG FLC NOTICED DURING PREFLT THE NEXT MORNING AFTER AN OVERNIGHT LAYOVER, THAT ONE OF THE ENG EPR GAUGES WAS NOT FOR THE CURRENT MODEL ENGS INSTALLED ON THE ACFT. THEY HAD OPERATED THE ACFT WITH THE IMPROPER GAUGE THE NIGHT BEFORE.

Narrative: FLEW AN ACFT WITH AN IMPROPER RAM AIR TEMP/EPR GAUGE INSTALLER. ON MAR/XA/01, I FLEW AN ACFT FROM MKE TO MCI. ACFT IS A JT7 PWRED ACFT. THE PREVIOUS CREW HAD WRITTEN UP THE RAM AIR TEMP/EPR GAUGE, HAD IT REMOVED AND REPLACED, BUT MAINT INSTALLED A GAUGE THAT CORRESPONDS TO THE JT9 ENG. THIS CREW FLEW SEVERAL LEGS AND DID NOT DISCOVER THE PROB. WE RECEIVED THE ACFT ON AN ACFT CHANGE FOR OUR FINAL NIGHT FLT TO MCI. AT NIGHT, IT IS ALMOST IMPOSSIBLE TO TELL WHAT RATING THE RAM AIR TEMP/EPR GAUGE CORRESPONDS TO, IE, -7 OR -9. THE MARKINGS ON THE GAUGE ARE COVERED BY A SWITCH. THE ONLY WAY IS TO KNOW THE GAUGE HAS DIFFERENT RANGE OF SETTINGS FOR A CORRESPONDING TEMP. I DID NOT NOTICE THE DIFFERENCE. THIS PROB WAS DISCOVERED THE NEXT DAY WHEN A CAPT QUESTIONED THE SETTING THE FO HAD SET IN THE EPR GAUGES FOR TKOF. TO CORRECT THIS PROB, MAINT SHOULD XREF THE PART NUMBER IN THE TECHNICAL MANUALS TO ENSURE THE PROPER GAUGE IS INSTALLED IN THE ACFT. IN THE FUTURE, I WILL BE SURE THE PROPER GAUGE IS INSTALLED FOR ALL FLTS BY CHKING THE MARKINGS ON THE GAUGE AND XREFING THE EPR'S ON THE TKOF PWR SETTING (TKOF DATA).

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.

Air carrier medium large transport flight crew noticed during preflight the next morning after an overnight layover, that one of the engine EPR gauges was not for the current model engines installed on the aircraft. They had operated the aircraft with the improper gauge the night before.