Medium large transport flight crew has engine N2 overspd when engaging thrust reversers.

Attributes
ACN	245094
Time
Date	199306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 1500
ASRS Report	245094
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

During rollout on runway 4R at ewr, copilot engaged thrust reverser to second detent. As I called out 1.5 EPR, N2 went to red line around 94 percent for 1 second. We had flown same aircraft for 3 previous legs and reverse had worked normal. Maximum reverse is 93 percent N2. I believe that our new procedure of using maximum reverse (second detent) should be modified since this is the second time in 30 days I have seen first officer's overboost engines.

Original NASA ASRS Text

Title: MLG FLC HAS ENG N2 OVERSPD WHEN ENGAGING THRUST REVERSERS.

Narrative: DURING ROLLOUT ON RWY 4R AT EWR, COPLT ENGAGED THRUST REVERSER TO SECOND DETENT. AS I CALLED OUT 1.5 EPR, N2 WENT TO RED LINE AROUND 94 PERCENT FOR 1 SECOND. WE HAD FLOWN SAME ACFT FOR 3 PREVIOUS LEGS AND REVERSE HAD WORKED NORMAL. MAX REVERSE IS 93 PERCENT N2. I BELIEVE THAT OUR NEW PROC OF USING MAX REVERSE (SECOND DETENT) SHOULD BE MODIFIED SINCE THIS IS THE SECOND TIME IN 30 DAYS I HAVE SEEN FO'S OVERBOOST ENGS.

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.