(c)  
Check probe exhaust and inlet port openings for carbon buildup. If necessary, remove carbon with a straight piece of steel wire.

(d)  
Check exhaust pressure probes and manifold, without dismantling, to ensure that all connections are tight and free from leaks. Check that all lines and tubing are secure and that probes are in good condition.

(8)  
Check engine pneumatic components as follows:

(a)  
Check engine and nose cowl anti-ice valve fittings for broken or missing lockwire, anti-ice ducting for loose or broken clamps, and duct joints for loose bolts.

(b)  
Check pneumatic ducts for loose clamps; clamps and mounting bolts for broken or missing lockwire and ducts and flexible couplings for cracks or abrasions.

506 Feb 15/70 71-00
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(c)  
Check that all pneumatic support brackets are secure and free from cracks.

(d)  
Check pressure ratio bleed control for security of mounting and security of associated lines and fittings.

(e)  
Check gravel runway shutoff and modulating valve fittings for broken or missing lockwire and tubing for loose or broken clamps and for loose connections.

(9)  
Check pneumatic starter as follows:

(a)  
Examine starter exhaust duct for fine metal particles. If metal particles are found, this is an indication of turbine wheel blade tip failure. Replace starter (Ref Chapter 80, Starting).

(b)  
Examine starter housing at lubricating oil fill, drain plugs, seams, and joints for oil leakage.

(10)
Check ignition components as follows:

(a)  
Check exciter units for security of mounting, loss of hermetic seal, and loose connections.

WARNING:  BECAUSE OF DANGEROUSLY HIGH VOLTAGE IN THE IGNITION SYSTEM, THE IGNITION SWITCH MUST BE IN THE OFF POSITION AND THE SYSTEM INOPERATIVE FOR A MINIMUM OF 6 MINUTES BEFORE WORKING ON IGNITION SYSTEM COMPONENTS. AS ADDITIONAL PROTECTION, AFTER DETACHING IGNITER PLUG COUPLING NUTS, TOUCH CONNECTOR CONTACT TO IGNITER PLUG BODY SHIELD. THIS IS TO ENSURE COMPLETE DISSIPATION OF ENERGY.

(b)  
Check ignition harnesses and wiring for chafed insulation and crushed or frayed shielding. Check support brackets for security and coupling nuts for worn or stripped threads.

(c)  
Check igniter plugs for cracked insulators and loose leads.

(11)
Check fuel system as follows:

(a)  
Check the fuel control, fuel filter, fuel heater, fuel/oil cooler, fuel pump, and all connections to these components for signs of leakage. Check mounting clamps for loose check nuts and broken or missing lockwire.

(b)  
Check the pressurizing and dump valve for loose mounting bolts. Check valve connections for leaks.

(c)  
Deleted.

(d)  
Check all fuel tubing and flex lines for loose or broken clamps, loose or leaking connections, dents, nicks, chafing, and evidence of static leakage.

(e)  
Check the fuel flow transmitter for leakage or loose mounting bolts. Check the electrical connectors for tight connections and for loose or broken lockwire.

(12)
Check engine controls as follows:

(a)  
Check control cables for wear, fraying or kinking.

(b)  
Check engine cross-shaft and cranks for misalignment or binding.

(c)  
Check for loose or frozen rod end bearings.

(13)
Check the following miscellaneous items:

(a)  
Check hydraulic tubing in the nacelle area for discoloration which indicates overheating of hydraulic fluid.

(b)  
Check engine-driven hydraulic pump for security of mounting and freedom from leakage. Check all hydraulic lines for security, for loose or leaking connections, and for chafing.

(c)  
Check electrical wiring for chafing, broken insulation and loose connectors. Check wiring bundles for loose or broken support clamps.

(d)  
Check all engine overboard exhaust, breather, and drain lines for cowl mating seal damage, cuts and wear.

(e)  
Check engine mount fittings for cracks or damage. Check cone bolts for security, cracks, corrosion and that mount bolts are properly cotter keyed.

538 
71-00 Page 606  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/73 

NOTE:  Any crack shall be cause for component replacement.
NOTE:  If there was an engine failure or an accident which included the engine or nacelle, refer to AMM\5-51-61/201, Engine Seizure/Engine Surge/ Uncontained Failures.
　
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