TB 1--1520--248--20--55
c.The purpose of this TB is to provide an initial and recurring inspection to determine operational status of the
T703--AD--700B engine, National Stock Number (NSN) 2840--01--391--4397.
5. End Items to be Inspected. Not applicable.
6. Assembly Components to be Inspected. Not applicable.
7. Parts to be Inspected. Not applicable.
8. Inspection Procedures.
NOTE
In accordance with Interim Statement of Airworthiness Qualification
(ISAQ), improved OH--58D helicopters (2427RO), dated 7 June
2000, operation of aircraft with T703--AD--700B/C30R/1 engine
installed is prohibited in desert/sand environment where operation of
aircraft causes sand particles to become airborne and be ingested
by the engine.
a. Inspect aircraft DA Form 2408--16 to determine if subject T703--AD--700B, NSN 2840--01 391--4397 engine is
installed.
(1) If subject engine is not installed, inspection and correction procedures are complete. Clear red dash -- entry.
(2) If subject engine is installed, proceed to paragraph 8. b.
b. The initial inspection will be conducted as follows:
(1) If engine has previously experienced compressor stalls and/or exhibited instability during power transients; proceed
(2) Perform a one time flight to conduct a power assurance check and determine engine torque factor. If engine is operat-
ing below specification power, less than 1.0% engine torque factor as indicated by power assurance check; proceed to para-
graph 9.
c. The recurring inspection will consist of a power assurance check prior to first flight of the day in accordance with
the following: if engine is operating below specification power, 1.0% engine torque factor as indicated by power assur-
9. Correction Procedures. Subject to
findings in
accordance with paragraph 8.
a. Change aircraft condition status symbol on DA Form 2408--13 to red X.
b. Enter red X status symbol and the following statement on DA Form 2408--13--1: T703--AD--700B engine is unser-
viceable in accordance with TB 1--1520--248--20--55.
c. Replace engine. Use TB 1--1520--248--20--42 dated 20 July 2000, "Instructions for Replacing OH--58D Helicopter
T703--AD--700B Engine With T703--AD--700A engine, to complete this task.
10. Supply/Parts and Disposition.
NOTE
HQDA--ODCSOPS will prioritize units and repair
parts distribution in a separate follow on message.
a. Parts Required. Replacement of T700--AD--700B (250--C30R/1) engine, P/N 23056117, NSN 2840--01--391--4397
with T703--AD--700A engine, P/N 23055439, NSN 2840--01--333--2064 may be required.
b. Requisitioning Instructions. Contact Logistical Point of Contact in paragraph 16. b. for requisition instructions.
All requisitions shall use project code (CC 57--59) "XD7" (Xray Delta Seven).
NOTE
Project code "XD7" is required to track and establish
a data base of stock fund expenditures incurred by the
field as a result of Safety of Flight actions.
c. Bulk and Consumable Materials. Not applicable.
2