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B737-700 pilot reports reverse thrust outputs on company aircraft are not consistent with that with which the aircraft was certified.
| Attributes | |
| ACN | 717398 |
| Time | |
| Date | 200611 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : svmi.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| ASRS Report | 717398 |
| Events | |
| Independent Detector | other flight crewa |
| Consequence | other |
| Supplementary | |
| Problem Areas | Company Aircraft |
| Primary Problem | Aircraft |
Narrative:
B737-700 not meeting production (boeing) nominal reverse N1 at detent 2 or maximum reverse thrust and as a result less stopping margin being available than is calculated by opc for slippery runway operations. Aircraft numbers meet production nominal values. Aircraft numbers yield approximately detent 2 values in maximum reverse. Occasions of N1 between detent 2 and maximum values or 1 engine at detent 2 N1 and the other engine at maximum N1 with the same reverse lever position on both engines. Verification from boeing operations engineering that boeing production nominal values are correct and utilized in boeing performance module in the opc. (If so; display detent 2 and maximum values as appropriate on landing output page.) check for fleet reverse values to identify aircraft not meeting those values. Liaison with maintenance as to cause and remedy. Callback conversation with reporter revealed the following information: the reporter; a former technician pilot for his air carrier; is in conference with boeing and the air carrier to review and; if necessary; make appropriate corrections.
Original NASA ASRS Text
Title: B737-700 PLT RPTS REVERSE THRUST OUTPUTS ON COMPANY ACFT ARE NOT CONSISTENT WITH THAT WITH WHICH THE ACFT WAS CERTIFIED.
Narrative: B737-700 NOT MEETING PRODUCTION (BOEING) NOMINAL REVERSE N1 AT DETENT 2 OR MAX REVERSE THRUST AND AS A RESULT LESS STOPPING MARGIN BEING AVAILABLE THAN IS CALCULATED BY OPC FOR SLIPPERY RWY OPS. ACFT NUMBERS MEET PRODUCTION NOMINAL VALUES. ACFT NUMBERS YIELD APPROX DETENT 2 VALUES IN MAX REVERSE. OCCASIONS OF N1 BTWN DETENT 2 AND MAX VALUES OR 1 ENG AT DETENT 2 N1 AND THE OTHER ENG AT MAX N1 WITH THE SAME REVERSE LEVER POS ON BOTH ENGS. VERIFICATION FROM BOEING OPS ENGINEERING THAT BOEING PRODUCTION NOMINAL VALUES ARE CORRECT AND UTILIZED IN BOEING PERFORMANCE MODULE IN THE OPC. (IF SO; DISPLAY DETENT 2 AND MAX VALUES AS APPROPRIATE ON LNDG OUTPUT PAGE.) CHK FOR FLEET REVERSE VALUES TO IDENT ACFT NOT MEETING THOSE VALUES. LIAISON WITH MAINT AS TO CAUSE AND REMEDY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR; A FORMER TECHNICIAN PLT FOR HIS ACR; IS IN CONFERENCE WITH BOEING AND THE ACR TO REVIEW AND; IF NECESSARY; MAKE APPROPRIATE CORRECTIONS.
Data retrieved from NASA's ASRS site as of January 2009 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.