(g)
Remove the rig pin.
(h)
Operate the stator system to the closed position (actuator rod extended) (AMM 75-31-00/201).
(i)
Make sure the VSV indicator reads 35.4-37.2 degrees.
(j)
Make a record of the VSV position.
(k)
If the VSV's are not in these limits, go back to the rig check step for the VSV and continue.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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CFM56 ENGINES
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(l)
If the VSV's stay out of these limits on the closed stop, examine the installation of the position transmitter.
(m)
Operate the VSV's to the OPEN position (actuator rod
retracted).
(n)
Make sure the VSV indicator reads 0.5 degrees.
(o)
Move the VSV's to the closed position and remove the VSV actuation equipment (AMM 75-31-00/201).
CAUTION: BE CAREFUL WITH THE INSULATED CABLE WHEN YOU CLOSE THE FAN
_______ DUCT COWL AND THRUST REVERSER. IF YOU CLOSE THE FAN DUCT COWL AND THRUST REVERSER ON THE CABLE, DAMAGE TO THE CABLE WILL OCCUR.
(p) Close the thrust reverser (AMM 78-31-00/201) with the cable through the No. 3 latch.
S 835-013-C00
(5) Do a Dynamic Rigging Check of the VSV.
CAUTION: IF YOU USE A MERCURY THERMOMETER, KEEP THE THERMOMETER
_______ AWAY FROM THE AIRPLANE. MERCURY CAN CAUSE CORROSION TO SOME METALS IN THE AIRPLANE STRUCTURE.
(a)
Make a record of the temperature (in the shade of the nose gear wheel well) and the pressure at the location.
(b)
Make sure the applicable ENG ANTI-ICE and BLEED switches on the pilots' overhead panel (P5) are in the OFF position.
(c)
Use the Power Plant Operation (Normal) procedure to start the engine (AMM 71-00-00/201).
(d)
At the maximum N2 motor speed, before you supply the fuel and ignition, make sure the VSV's are at the closed stop (VSV indicator reads 35.4-37.2 degrees).
CAUTION: WHEN YOU USE THE 856A1214 P02 TEST SET, YOU MUST USE THE
_______ N2 INDICATION ON THE PILOTS' CENTER INSTRUMENT PANEL. THE N2 INDICATOR ON THE TEST SET GIVES AN INCORRECT N2 VALUE FOR THE CFM56-3 SWITCH POSITION.
(e)
Let the engine become stable at ground idle for 3 minutes.
(f)
Make a record of the N1 and N2 values.
(g)
Make a record of the VSV position from the transmitter indicator.
(h)
Use the Power Plant Operation (Normal) procedure to do an engine shut-down (AMM 71-00-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 975-014-C00
(6) Calculate the VSV position limits.
NOTE: If you use the VSV Limit Calculator, 856A2012P01, to find the
____ VSV limits, do not do the steps for the adjustment of the VSV bellcrank assembly to the actuation rings.
(a)
Calculate T25. 1) Use the N1 value that you wrote down to find .T25 (booster
temperature rise) from Fig. 503.
2) T25 = .T25 + ambient temperature value.
(b)
Calculate the corrected N2K25.
1) Use T25 to find the correction factor in Fig. 504.
2) N2K25 = N2 value x correction factor (CR)
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