R 0 0 0
R 1 1 0.1
R 2 3 0.1
R 3 5 0.2
R 4 6 0.2
R 5 8 0.3
R 6 10 0.4
R 7 13 0.5
R EXAMPLE: For a level 2 N1 modifier at the 5B6 rating, DEGT = 3 deg. C
R and N2 = 0.1 percent as follows:
R - EGT adjusted = 685 - 3 = 682 deg. C
R - N2 adj. = 93.88 - 0.1 = 93.78 percent
R (8) Compare the data collected during the power assurance check to the
R permitted limits.
R (Ref. Fig. 508/TASK 71-00-00-991-314)
R EXAMPLE: Enter Ref. Fig. at OAT or TAT of 25 deg C
R - EGT MAX = 654 deg. C and N2 MAX = 94.2 percent.
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R (a) Further adjustment of the limits is required if the engine is not R at the 5B3 rating. The adjustments for EGT and N2 are obtained R from the table below. R EXAMPLE: The engine rating of interest is the CFM56-5B6. The EGT R adjustment is 72 degrees and the N2 adjustment is 1.2 percent. R R CFM56-5B Rating Conversion at 72.5 Percent Power
R -------------------------------------------------------------------------------R Conversion to EGT DEG. C N2 PERCENT R _______________________________________________________________________________ R ---R B1 45 0.7 R B2 29 0.3 R B3 0 0.0 R B4 & B7 40 0.4 R B5 91 1.8 R B6 72 1.2 R B8 108 2.1 R B9 75 1.2
R (b) Add the adjustments to EGT and N2 to find the limits for the R engine rating. R EXAMPLE: Limits for a CFM56-5B6 engine. R - EGT MAX adjusted = 654 + 72 = 726 deg. C R - N2 MAX adj. = 94.2 + 1.2 = 95.4 percent
R (c) Compare data collected during power assurance check to the R limits. The margins calculated in this step will apply to sea R level takeoffs.
R CAUTION : TAKEOFFS AT ALTITUDE MAY REQUIRE GREATER EGT MARGIN
_______ R THAN AT SEA LEVEL.
R EXAMPLE: EGT MAX = 726.0 deg C and N2 MAX = 95.4 percent R - EGT Margin (EGT MAX adj - EGT adj) = 726 - 682 = 44 deg C R - N2 Margin (N2 MAX adj - N2 adj) = 95.4 - 93.8 = 1.6 percent
R (9) Further adjust the EGT margin for altitude effect. If the aircraft R regularly operates at airports above 3000 feet, an adjustment to the R calculated EGT margin may be needed. The table below shows altitude R adjustments to sea level EGT margin for various ratings. No R adjustment for B1, B2 or B3 ratings is necessary since altitude EGT R margin is equal to or greater than sea level EGT margin. 5B4 through R 5B9 ratings will require adjustment per the following table for
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R altitudes above sea level. Adjustment values are either read directly
R from the table or are interpolated if the desired altitude lies
R between table entries. Always use the worst-case (most negative)
R value for the altitude range being considered.
R -------------------------------------------------------------------------------R Flight Condition Adjustments
R Rating Altitude ft dEGT deg C
R _______________________________________________________________________________
R
R B1 0 to 8k 0
R B1 10k 10
R
R B2 0 to 8k 0
R B2 10k 10
R
R B3 0 to 3k 0
R B3 10k 26
R
R B4 & B7 0 to 4k 0
R B4 & B7 6k to 8k -14
R B4 & B7 12k 11
R
R B5 0k 0
R B5 4k to 8k -17
R B5 13k -31
R
R B6 0k 0
R B6 3k -17
R B6 10k to 12k -30
R
R B8 0 to 7k 0
R B8 13k -11
R
R B9 0k 0
R B9 3k -9
R B9 10k -32
R EXAMPLE: For a 5B6 engine at 5000 feet above sea level: The 5B6 EGT
R margin is lower by 17 degrees at 3000 feet and is lower by 30 degrees
R at 10000 feet according to the table. Using interpolation, the
R adjustment at 5000 feet is:
R - EGT marg adj = (-30 - -17) X (5000-3000)/(10000-3000) + (-17) =
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