TB1--1520--238--20--94
(1) Wholesale stock-- Same as Paragraph 1F
(2) Retail Stock--
Same as Paragraph 1F
g. Aircraft at the Boeing, Mesa production facility will be inspected by the contractor.
2.
Task/Inspection Suspense Date. Within 10 flight hours/ 14 days.
3.
Reporting Compliance Suspense Date.N/A.
4.
Summary of the Problem.
a. Investigation into a BUCS activation in--flight has revealed a suspect condition in the BUCS AH--64A
and AH--64D servocylinders. The servocylinder contains a Linear Variable Differential Transducer (LVDT)
which may move out of an electrical null position. The LVDT transmits the position of the piston to the Digital
Automatic Stabilization Equipment Computer (DASEC) or Flight Management Computer (FMC). If the LVDT
probe moves out of the null condition, this will cause a BUCS system activation.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to direct initial and recurring inspections of the AH--64A and AH--64D BUCS
Servocylinders for correct electrical null.
5. End Items to be inspected. All AH--64A aircraft with Serial Numbers 88--0200 and subsequent
(PV530 and subsequent) and all lot 2 and subsequent AH--64D (97--5027 and subsequent). .
6.
Assembly Components to be Inspected. N/A
7.
Parts to be Inspected.
a. Nomenclature--Lateral/Collective Servocylinder
Parker Hannifin P/N
MDHS PART NUMBER
NATIONAL STOCK NUMBER
289300--1019
7--311820011--13
1650--01--273--7610
289300--1017
7--311820011--11
1650--01--273--7610
289300--1015
7--311820011--9
1650--01--273--7610
289300--1009
7--311820011--7
1650--01--273--7610
289300--1007
7--311820011--5
1650--01--273--7610
b. Nomenclature-- Longitudinal Servocylinder
Parker Hannifin P/N
MDHS PART NUMBER
NATIONAL STOCK NUMBER
308900--1015
7--311820012--13
1650--01--273--7609
308900--1013
7--311820012--11
1650--01--273--7609
308900--1011
7--311820012--9
1650--01--273--7609
308900--1009
7--311820012--7
1650--01--273--7609
308900--1007
7--311820012--5
1650--01--273--7609
c.
Nomenclature-- Directional Servocylinder
Parker Hannifin P/N
MDHS PART NUMBER
NATIONAL STOCK NUMBER
289400--1009
7--311820014--7
1650--01--273--7608
289400--1007
7--311820014--5
1650--01--273--7608
289400--1005
7--311820014--3
1650--01--273--7608
2
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