Summary of the Problem. - TB-1-1520-237-20-2070002

TB 1-1520-237-20-207

e. Maintenance Trainers (Category A and B). N/A

f. Component/Parts in Stock at all Levels (Depot and Others) including war reserves. Upon receipt of this Technical

Bulletin the material condition tags of all items in all condition codes listed in paragraphs 6 and 7 shall be annotated to

read" UH-60-99-ASAM-02, UH-60 External Hoists manufactured by Breeze Eastern not complied with."

(1) Wholesale Stock. N/A.

(2) Retail Stock. Upon receipt of this Technical Bulletin Commanders and others maintaining retail stock at

installation level and below shall contact the supported Aviation Unit to perform the inspection required by paragraph 8

and the correction procedures of paragraph 9 on discrepant materiel. Disposition of discrepant materiel will be IAW

paragraph 10. Report compliance with this Technical Bulletin IAW paragraph 14d(2).

g. Components/Parts in work (Depot Level and other). N/A.

2. Task/Inspection Suspense Date . Within next 10 flight hours/14 days or prior to next use of the External Hoist,

whichever comes first.

3. Reporting Compliance Suspense Date .

No later than 24 November 1998 per paragraph 14a of this Technical

Bulletin.

4. Summary of the Problem.

a. In 1994, the Hydraulic Hoist was upgraded to the BL27100-192 configuration to reduce the probability of wire

entanglements and breakage. This modification included a reduced length of the cable and a large Tension Roller. A

safety of use Technical Bulletin (SOU-ATCOM-96-007) was published to inspect and upgrade all fielded units. All of the

hoists in Army service were subsequently upgraded to the P/N BL27100-192 configuration by the manufacturer. On 9

may 1998, one hydraulic hoist was involved in a wire entanglement incident, QDR M 18H90252. Analysis of the QDR

exhibit by the manufacturer revealed that, subsequent to the upgrade, one of the older style Tension Rollers had been

installed in the hoist. DLA issued the old style Tension Roller to the unit in 1996. The electric hoist, P/N BL29900-30,

Installed on the UH-60Q uses the same part number Tension Roller. The U.S Navy experienced corrosion issues at the

interface of the rescue hoist arm base support and the airframe support fitting on SH-60B Aircraft. The cause of the

Problem was determined to be water entrapment at the interface, mostly attributed to sealant blocking the airframe fitting

drain hole. In and effort to improve cabin water integrity, some Army H-60 Aircraft did not include a drain hole in the initial

installation. Elimination of the corrosion problem requires clearing the drain hole of any sealant or adding a drain hole. To

maintain cabin water tight integrity. The owning units may incorporate a locally manufactured drain line kit to direct water

flow outboard of the door. Contact the technical point of contact (POC) of paragraph 16a for details about this kit.

b. For manpower/downtime and funding impacts, see paragraph 12.

c. The purpose of this TB is to:

(1) Direct an inspection of all External Rescue Hoists manufactured by Breeze-Eastern to ensure that the

correct Tension Rollers are installed.

(2) Inspect for corrosion and correct all External Hoist installations to allow proper drainage.

5. End Items to be Inspected. All H-60 with airframe provisions for mounting External Rescue Hoist and all external

hoists manufactured by Breeze-Eastern.

6. Assembly Components to be Inspected.