TB 1-1520-238-20-66
2. Task/Inspection Suspense date. Prior to next flight.
3. Reporting Compliance Suspense Date. Within 15 working days of the date of this Technical Bulletin per
4. Summary of the Problem.
a. A recent AH-64A mishap investigation determined the presence of an improperly adjusted SPAD's
microswitch. This condition prevented the BUCS from activating when a SPAD shear pin was broken. A
number of aircraft were subsequently inspected and several shown to have relatively minor quality errors.
c. The purpose of this TB is to direct an inspection for security and adjustment of the BUCS
microswitches located in the SPADS. This inspection will also be required at every Phase Maintenance
Inspection.
5. End Items to be inspected. AH 64A aircraft, serial numbers 85-25477, 88-0200 and subsequent. All BUCS
active AH-64A aircraft currently located at McDonnell Douglas Helicopter Systems, Mesa. AZ will be
inspected/corrected by the contractor.
6. Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
STOCK NUMBER
CPG Collective Arm Assembly
7-311513004 5
N/A
CPG Collective Arm Assembly
7-311513005 5
CPG Directional SPAD
7-311516077-7
CPG Lateral Ann Assembly
7-311514088-23
N/A
CPG Longitudinal Assembly
7-311515081
Pilot Collective Arm Assembly
7-311 412087-5
N/A
Pilot Directional SPAD
7-311517067-9
Pilot Lateral Arm Assembly
7-311514088-19
N/A
Pilot Longitudinal Assembly
7-311517069-7
7.Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
SPAD Shear Pin (typical)
7-211514082
2