Textron Bell 412, Maintenance Manual

Page: 72 / 288

BHT-412-MM-2
5-00-00
Page 40
Rev. 26 01 JUN 2018 Export Classification C, ECCN EAR99
Chapter 65 TAIL ROTOR DRIVESHAFT
1. Hanger assemblies for cracks at mounting ears, corrosion,
and security of attachment.
2. Hanger supports for condition and security of attachment.
3. Driveshaft sections and attaching hardware for condition
and security.
4. S/N 33001 through 36019 not modified by
412-570-001-103 or Pre BHT-412-SI-74 (412SP to 412HP
Upgrade) check:
a. Condition of clamps for tail rotor driveshaft coupling to
gearbox couplings (90

apart).
b. Inspect clamps for cracks in or near the bolt hole lugs.
5. For helicopters S/N 36020 through 36999, S/N 37002
through 37999, S/N 38001 through 38999, S/N 39101 through
39999, and helicopters modified by 412-570-001-103 or Post
BHT-412-SI-74 (412SP to 412HP Upgrade), check disc pack
couplings and attaching hardware for condition and security.
Chapter 65 INTERMEDIATE GEARBOX
1. Inspect chip detector for debris. If metallic particles are
found, determine and correct cause.
2. Clean chip detector.
3. Test chip detector electrical circuit.
Chapter 67 FLIGHT CONTROLS
1. Inspect all control tube assemblies for clearance, security,
and general condition.
2. Inspect tube bellcranks, supports, and attaching hardware
for corrosion, security, wear, and damage.
3. Collective and cyclic flight control actuators, check:
SCHEDULED INSPECTIONS
5-6. 100 HOUR/12 MONTH INSPECTION — PART A (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER