alb@alice.UUCP (Adam L. Buchsbaum) (01/05/84)
NASA has decided to take the three APU's from the Discovery, now sitting in the VAB, and put them in the Challenger. This follows the fuel leak and subsequent fire i two of the three APU's used on Columbia during STS-9. Discovery's APU's, the same as Challenger's, are newer and have been used less, and NASA is transferring them only as a safeguard, since they do not ye know why the Columbia's leaked. The APU work is expected to be completed in time for the 12 January rollout of the Challenger to pad 39A, from where it will be launched on 3 February. Discovery will be prepared for its April maiden flight after Challenger is moved to the pad.