Hubble Presentations
Fuel Module Investigation
Denis McCloskey / Lockheed Missiles and Space Corporation
Fuse Module Description
- There are three different fuse module configurations (4 each) in the HST SSM.
- Four P-15 modules (3 and 5 Amp fuses) were replaced since one had opened and the RSU fuses were increased in size from three Amps to five Amps.
- Four P-16 modules (10 and 20 AMP fuses) were replaced since their configuration was questionable.
- Spare P-17 and OTA fuses were carried as contingency but were not replaced.
Returned Hardware Testing
- Visual inspection/photographs.
- Baseline Milli-Ohm test per NSI 36-02-1152.
- Baseline high voltage test per NSI 36-02-1152.
- Resistance versus current tests.
- Destructive tests.
Overview of P-16 Wiring Problem
- A flight spare P-16 module was found to be miswired during ground testing.
- Two of the four P-16 modules replaced during the servicing mission were miswired.
- All 20 AMP fuses in S/N's 1006 and 1007 were shunted by the twin low resistance leads such that negligible current could flow through the fuse.
Conclusions
- Ground test verified open fuse elements in the P-15 fuse module (S/N 1012).
- Ground test verified miswiring of two P-16 fuse modules (S/Ns 1006 and 1007).
- No additional discrepancies or degradation of the modules were observed.
Return to Hubble Space Telescope Hardware Archive System