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E.  Several momentarily high over temperatures have as profound an effect on the expected service life of an engine as a single prolonged over temperature of lesser degree. The higher the over temperature, the less the time interval before serious engine damage occurs and, therefore, the more extensive the inspection required. Conversely, the lower the over temperature the more time before serious damage occurs and the less stringent the inspection required.
F.  The over temperature limits (Fig. 205) present the inspection procedures to be followed after an engine has been subjected to an over temperature condition.
G.  Oil Consumption
(1)  
For all engines without No. 4 bearing carbon seal oil consumption must not exceed 2 quarts or 0.50 gallons per hour.

(2)  
For all engines with No. 4 bearing carbon seal (incorporated in original build or by P&WA SB 5250) oil consumption must not exceed 1 quart or 0.25 gallons per hour.

(3)  
Engine, which exceeds these limits, shall be investigated.

539 
71-09-100 Page 216  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/01 

Operating Condition  Time Limit (Minutes)  Max Observed Exhaust Gas Temp (EGT) °C  Oil Press. PSIG Normal *[1]  Maximum Oil Temperature °C *[5] 
Takeoff  5  650 *[6]*[7]  40-55  130 
Max Continuous  Continuous  610 *[6]*[7]  40-55  130 
Max Cruise  Continuous  580 *[6]*[7]  40-55  130 
Idle  Continuous  475 *[4]*[6] 535 *[4]*[6] 499 *[4]*[7] 559 *[4]*[7]  40 Min  130 
Starting  Momentary  550 *[2]*[6] 575 *[2]*[7] 
Acceleration  *[3]  660 *[6]*[7]  40-55  130 

*[1]  Normal oil pressure is 40 to 55 psi. At idle and above, oil pressures between 35 and 40 psi are undesirable. The cause of the low oil pressure indication should be investigated and the fault corrected immediately. Oil pressures below 35 psi are unsafe and the engine should be shut down immediately.
*[2]  This temperature is time-limited to momentary for starting. If the maximum allowable starting temperature is exceeded, the engine should be shut down and inspected in accordance with the instructions in Chapter 72, P&WA Maintenance Manual. The starting period ends when N2 rpm essentially stabilizes with the aircraft throttle in the idle detent. The use of fast-response EGT probes on this engine eliminates the need for two ground starting temperature limits.
NOTE: Momentary is considered a period not to exceed 15 seconds.
*[3]  Acceleration limit is intended only to allow for transitory EGT indications. Stabilized EGT must be at or below Operating Limit for applicable Operation Condition within 2 minutes of advancing throttle.
553  Engine Starting and Operating Limitations 
Feb 01/95  Figure 205 (Sheet 1)  71-09-100 
Page 217 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

*[4]  When airbleed or power extraction is used, 480°C is applicable for JT8D-7, -7A, -7B, -9, -9A; 535°C is applicable for -15, -17, -17R; and 559°C is applicable for -15A, -17A, -17AR. When no airbleed or power extraction is used, 420°C is applicable for JT8D-7, -7A, -7B, -9, -9A; 475°C is applicable for -15, -17, -17R; and 499°C is applicable for -15A, -17A, -17AR. This is a reference temperature which, if exceeded, would indicate an abnormal engine operating condition. Further operation of an engine exhibiting this condition should be at the discretion of the operator.
*[5]  If, during operation of JT8D-17 and -17A engines, engine oil temperature exceeds steady state temperature limit of 266°F (130°C) for not more than 15 minutes, the engine may be continued in service only after cause of overtemperature has been determined and corrected. If oil-in temperature exceeds maximum steady state temperature of 266°F (130°C) for more than 15 minutes but does not exceed 329°F (165°C), engine oil shall be drained, all external oil screen elements shall be inspected for foreign matter, and corrective action taken for cause of overtemperature.
NOTE:  After throttle reduction at end of Cruise and start of Descent, it is permissible for oil temperature to exceed 266°F (130°C) for not more than 15 minutes, provided it does not exceed 329°F (165°C), with no determination of cause or maintenance action.
*[6] Effective for JT8D-17 engines only. *[7] Effective for JT8D-17A engines only.
Engine Starting and Operating Limitations  553 
71-09-100  Figure 205 (Sheet 1A)  Feb 01/95 
Page 218 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 
　
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