1、Lessons Learned Entry: 0122Lesson Info:a71 Lesson Number: 0122a71 Lesson Date: 1992-08-17a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Slack Removal from Hoisting Sling Description of Driving Event: Task leader started hoisting operation with a “slow micro“ command to ta
2、ke up sling slack until 337 lbs was obtained. A joystick controls hoist movement which may be controlled at a low rate, but only by operator judgement. A switch energizes the hoist motor and disengages the brakes when depressed. If the joystick is in the null position when the button is depressed, l
3、oad movement will occur with speed dependent on stick position when the brake is released. An overload at 900 lbs in the IPS resulted when “slow micro“ was requested and the brake button was depressed with the joystick not in the null position.Lesson(s) Learned: The speed associated with crane comma
4、nds is a matter of operator judgement and may result in an overload to the instrument pointing system (IPS).Recommendation(s): Utilize hydrasets to apply a desired load at a predetermined speed to the IPS during hoisting operations.Evidence of Recurrence Control Effectiveness: N/ADocuments Related t
5、o Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Ground Operationsa71 Industrial Operationsa71 Lifting Devicesa71 TransportationAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
