ENGINE NOSE GEARBOX FLEXIBLE COUPLING, VANEAXIAL FAN, AND INLET DIFFUSER
Unless otherwise specified, the following inspection procedures apply to flexible coupling, vaneaxial
fan, and inlet diffuser (regardless of diffuser design type).
a. Check for cracks. None allowed.
b. Check for corrosion (para 1.49).
c. Check for elongated bolt holes (where applicable), scratches, nicks, dents, and gouges.
(1) Damage not to exceed 15 percent of material thickness or 0.050 INCH (whichever is less). Use depth gage.
d. Check threaded holes (where applicable) for stripped, crossed, or flattened threads. None allowed.
e. Check for rubbing between fan and inlet diffuser. Rubbing is acceptable within following limits:
(1) Rub marks on inner diffuser shall not exceed 0.005 INCH in depth and shall not exceed 120 degrees of
inner circumference. Use depth gage.
(2) The fan shall rotate freely within inlet diffuser when turned by hand.
(3) Bent or broken blades. None allowed.
f. Check output shaft for serviceability (para 6.17).
g. Check coupling for loose or damaged nutplates (para 6.17).
h. Check inlet diffuser mounting flanges for damaged inserts. None allowed. Repair in accordance with
The following inspection procedures apply to inlet diffuser only if it is of type designed to be used with
a two section outer diffuser.
i. Check clamping catches for damage and looseness. None allowed. Repair in accordance with paragraph
j. Check mounting flanges for loose or missing dowel pins. None allowed.
a. Repair inlet diffuser by replacing clamp catches and inserts (TM 1-1500-204-23).
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