Textron Bell 412, Maintenance Manual

Page: 122 / 288

BHT-412-MM-2
5-00-00
Page 86
Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99
Chapter 71
ASB 412-10-140 6. Inspect the left side and right side engine air inlet cowlings
for gaps between the lower surface of the cowling firewall and
the mating horizontal engine firewall.
Chapter 76 7. Engine fuel and power controls:
a. Engine control linkages for looseness, lost motion,
chafing, damage, and security of attachment.
b. Bellcranks, mounts, and jackshafts for looseness,
damage, and security of attachment.
c. Check controls for smooth movement throughout full
range of travel.
Chapter 26 8. Engine fire detection systems for condition and security.
TAILBOOM
Chapter 53 1. Tailboom structure:
a. Tailboom exterior structure for corrosion and damage.
b. Tailboom interior structure for corrosion and damage.
c. Inspect tailboom joints, splices, longerons, attach
fittings, and attaching hardware for corrosion, damage, and
cracks.
ASB 412-90-49 d. Remove plug button at BS 99.00.
NOTE
Paint fissures are common in the splice area, cracks
will be evident by black powder emanating from
cracked area, corrosion will leave evidence of white
powder.
e. Using a borescope or other suitable means, inspect
inside of longeron paying particular attention to cracking and/or
corrosion in area of splice.
f. Report any cracks to Product Support Engineering.
SCHEDULED INSPECTIONS
5-10. 300 HOUR/12 MONTH INSPECTION — PART B (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER