Repaired Acceptance Peak Vibration Limits in the
46.5 to 58.2% N1 Range
NOTE:  These limits are correct only when the vibration sensors are attached at the locations shown in Fig. 502 and only when the low frequency filter (40 Hz) is in the vibration monitor circuit.
*[1] Idle to 58.2% N1.
501 71-00 Feb 20/92 Page 510
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

501  Vibration Sensors Installation 
Feb 20/92  Figure 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-00 Page 511 

POWER PLANT (JT8D) - INSPECTION/CHECK
1.  Power Plant (JT8D) - Check
A.  General
(1)  
Examination of the power plant is required to assure that the engine, including its components and accessories, is in good physical condition and proper working order. Proper checking of the wing mounted engines on the 737 is facilitated by the easy access to the low engines.

(2)  
Engine compartment cleanliness is important because the intensive mass airflow tends to draw foreign objects into the engine. Thoroughly clean and check area after completion of any work. Keep the inlet area free of dirt, oil, and grease and remove all unused parts such as nuts, washers, and pieces of lockwire. In order to prevent corrosion in the compressor stages and damage to the second stage fan disc and blades, it is recommended that the engine inlet and tailpipe be suitably covered whenever the engine is left inoperative for more than six hours. When there is freezing precipitation or sufficient wind to rotate the engine, it is particularly important to cover the engine immediately.

(3)  
The check provided in this section is essentially a visual examination which can be accomplished by one man at the power plant. Its purpose is to check the power plant physical condition.

B.  Check Power Plant
NOTE:  Checking some of the power plant components will be facilitated by shutting down the engine in the reverse thrust configuration.
WARNING:  TO PREVENT POSSIBLE SERIOUS INJURY TO PERSONNEL, ENSURE THAT THE THRUST REVERSER SYSTEM IS DEACTIVATED PRIOR TO PERFORMING THE FOLLOWING CHECKS. ENSURE THAT THE APPLICABLE SYSTEM CONNECTIONS, VALVES, AND SWITCHES ARE APPROPRIATELY TAGGED TO PREVENT SYSTEM OPERATION. REFER TO EXHAUST, CHAPTER 78.
(1)  Check engine cowling as follows:
(a)  
Check cowl panel skin, covers, doublers, and frames at duct outlets for cracks and loose fasteners. Check access doors for cracks, loose fasteners, and loose hinges.

(b)  
Check vent ports, breather openings, drain holes and exhaust ports are free of obstructions.

(c)  
Check nose cowl, nose dome, and secondary air inlet doors for cracks, loose rivets and dents or gaps.

(d)  
Check cowl panel support rods for correct functioning of hinge bolts, stowage clips and safety pins.

(e)  
Check fuel drain and breather seals for cuts and wear.

(f)  
Check cowl panel hinge fittings, latches and U-bolts for wear, cracks, corrosion, and loose fasteners. Check cowl panel skin at frame and longeron attachments for cracks, loose fasteners and broken spot welds.

(g)  
Check latches for cracks, bent links and pins, ease of latching and positive
engagement. If latches require adjustment, refer to 71-11-11 A/T.

(h)  
Check gearbox oil breather duct on inside of cowl for possible damage. Check spring retainer for freedom of movement and breather duct seal for proper seating.

(i)  
Visually check if the aft end of engine and thrust reverser fairing has dropped producing a noticeable mismatch with aft strut fairing, thus exposing a painted red stripe on aft end of aft strut fairing. On airplanes with aft engine indicator markings check to see if aft mount indicator pointer is within "ok" zone on the thrust reverser fairing. If mismatch is detected, check aft mount for possible cone bolt failure.

501 
Feb 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-00 Page 601 

NOTE:  To check thrust reverser fairing mismatch with aft strut fairing, ensure that the thrust reverser is stowed and locked.
(2)  
Check power plant oil levels as follows:

(a)  
Check engine oil tank level within 30 minutes after engine shutdown by checking the dipstick attached to the self-locking filler cap or the max/min sight gages (when fitted).

(b)  
Check the constant speed drive oil level at the sight gage on the CSD. The operating range is within the applicable white band, depending upon whether the engine is in the left or right position.
　
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