Investigation of the Challenger Accident · 1986

ELECTRICAL

ELECTRICAL

As a r e s u l t of the l a t e s t engineering analysis o f the V - I case I t appears t h a t high-stress r i s e r s t o the case are created by the phenolic OF1 housings and fairings. As I t presently stands. these w i l l probably ' have t o be modified o r rmoved and i f rclloved w i l l have t o be replaced. n This could have an Impact on the launch schedule. c.

a N \n u! E

287

J. McDonald, Director

1 October 1985 E!SO/RVE-86-47 Page 2

FINAL ASSEMBLY

One SRM 25 and two SRH 26 segments along with two SRW 24 exit cones were completed during this period. Only three segments are presently in work. Availability o f igniter cunponents. nozzles and systems tunnel tooling are the present constraining factors in the final assembly area.

IGNITION SYSTEM

1. Engineering is currently rewriting igniter gask-o-seal coating requirements to allow minor flaws and scratches. Bare metal areas will be coated with a thin film of HD-2 grease. Approval is expected within the week. 2. Safe and Am Device component deliveries i s beginning to cause concern. There are five S M ' s at KSC on the shelf. Procurement, Program Office representatives visited Consolidated Controls to discuss accelerating scheduled deliveries. CCC has promised 10 Am's and 30 B-8's no later than 31 October 1985.