Flight crew of an MD80 rejected takeoff due to the left engine pressure ratio (EPR) indication was low. Subsequently found that the EPR gauge knob partial out and pushed it in and tested on run up. All checked ok and successful takeoff accomplished.

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Attributes
ACN	411568
Time
Date	199808
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rno
State Reference	NV
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : jfk
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 19000 flight time type : 4000
ASRS Report	411568
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 1500
ASRS Report	411786
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : rejected takeoff flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were cleared for takeoff on runway 16R in reno. I stepped the power up and waited for both engines to spool evenly before asking for autothrottles on. The left engine lagged behind the right. At 1.46 EPR on the right engine EPR flag appeared. I then pulled both engines to idle and asked to clear the runway. All engine indications were normal except the right EPR gauge. I found the right EPR gauge control knob partially back and pushed it in. The flag went away and indications were normal. We then asked to do a run up and all indications were normal. We departed with no abnormal indications. Supplemental information from acn 411786: I have heard of this occurring previously on aircraft with manually adjusted EPR knobs. Manufacturer and operations should amend before start procedures to include pushing in the manually adjusted EPR control knobs.

Original NASA ASRS Text

Title: FLC OF AN MD80 REJECTED TKOF DUE TO THE L ENG PRESSURE RATIO (EPR) INDICATION WAS LOW. SUBSEQUENTLY FOUND THAT THE EPR GAUGE KNOB PARTIAL OUT AND PUSHED IT IN AND TESTED ON RUN UP. ALL CHKED OK AND SUCCESSFUL TKOF ACCOMPLISHED.

Narrative: WE WERE CLRED FOR TKOF ON RWY 16R IN RENO. I STEPPED THE PWR UP AND WAITED FOR BOTH ENGS TO SPOOL EVENLY BEFORE ASKING FOR AUTOTHROTTLES ON. THE L ENG LAGGED BEHIND THE R. AT 1.46 EPR ON THE R ENG EPR FLAG APPEARED. I THEN PULLED BOTH ENGS TO IDLE AND ASKED TO CLR THE RWY. ALL ENG INDICATIONS WERE NORMAL EXCEPT THE R EPR GAUGE. I FOUND THE R EPR GAUGE CTL KNOB PARTIALLY BACK AND PUSHED IT IN. THE FLAG WENT AWAY AND INDICATIONS WERE NORMAL. WE THEN ASKED TO DO A RUN UP AND ALL INDICATIONS WERE NORMAL. WE DEPARTED WITH NO ABNORMAL INDICATIONS. SUPPLEMENTAL INFO FROM ACN 411786: I HAVE HEARD OF THIS OCCURRING PREVIOUSLY ON ACFT WITH MANUALLY ADJUSTED EPR KNOBS. MANUFACTURER AND OPS SHOULD AMEND BEFORE START PROCS TO INCLUDE PUSHING IN THE MANUALLY ADJUSTED EPR CTL KNOBS.

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.