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The performance factors page permits the display and entry of performance factors to optimize airplane performance for individual operators or airplane characteristics.
Page Access
You use the PERF FACTR line select key (3R) on the FMCS BITE page to get access to the performance factors page.
This page will automatically show if there is a performance factors mismatch during power-up and it is the only mismatch.
Performance Factors Page
The aerodynamic and engine models in the performance data base are from airplane design and flight test data. Since each production airplane may be different, the FMCS PERF FACTORS page lets the operator make adjustments for some of the factors in the model/engine database.
If the two FMCs do not agree on the value for a performance factor, the factor is highlighted. In the example shown on the graphic, FMC 2 does not agree with the value for the engine out minimum rate of climb.
Line select key 2L shows the DRAG FACTOR value. This is a correction factor applied to drag calculations and is a percentage. The default value is 0.0 and the allowable entry range is - 9.9 to + 9.9
Line select key 3L shows the fuel flow (F-F) value. This is a correction factor applied to fuel flow calculations and is a percentage. The default value is 0.0 and the allowable entry range is -9.9 to + 9.9.
Line select key 4L shows the maneuver margin (MNVR MARGIN) value. The maneuver margin is used for flight envelope and bank angle calculations. The default value is 1.3g and the allowable entry range is 1.2g to 1.6g.
Line select key 5L shows the minimum cruise time (MIN CRZ TIME) value in minutes. This value is a lower limit to the minimum cruise time from the performance data base for trip altitude calculations. The default value is 1.0 and the allowable entry range is 1.0 to 20.
Line select key 6L shows the INDEX prompt. This selects the FMCS BITE page.
Line select key 3R shows the minimum rate of climb (MIN R/C CLB) value in feet/minute. This is a margin for flight envelope calculations at climb speed and maximum climb thrust. The default value is 300 and the allowable entry range is 0.0 to 999.
Line select key 4R shows the minimum rate of climb (MIN R/C CRZ) value in feet/minute. This is a rate of climb margin for flight envelope calculations at cruise speed and maximum cruise thrust. The default value is 300 and the allowable entry range is 0 to 999.
Line select key 5R shows the minimum rate of climb (MIN R/C ENG OUT) value in feet/minute. This is a margin for flight envelope calculations at engine out speed and maximum continuous thrust. The default value is 300 and the allowable entry range is 0 to 500.
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved

A34-61-00-063.fm
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737-700 MAINTENANCE TRAINING MANUAL

FMCS BITE PAGES - PERFORMANCE FACTORS
Line select key 6R permits the entry of the word ARM. This is a necessary entry to enable data entry on this page. After you enter ARM and push LSK 6R, you may enter the new value into the scratch pad and line select it to the applicable performance factor.
January 2005
34-61

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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

A34-61-00-063.fm
FMCS BITE PAGES - PERFORMANCE FACTORS

January 2005
34-61

- 108 -
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved

A34-61-00-062.fm
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

FMCS BITE PAGES - IRS MONITOR
General
To see the ADIRU inertial reference position error rate, select IRS MONITOR on line select key (LSK) 5R, from the FMCS BITE page.
IRS MONITOR Page
The position error rate (nautical miles per hour) for each ADIRU inertial reference shows at LSK 2L and 5L on this page.
　
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