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NASA NTRS · Technical Memorandum (TM)
Water/glycol temperature control circuit failed in the automatic mode: Apollo 16
Attribution
This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Legacy CDMS.
Abstract
Verbatim from NASA NTRS. Not paraphrased, not summarized.
An anomaly report concerning failure of the water/glycol temperature control circuit during the Apollo 16 flight is presented. The anomaly is described and diagrams of the system are presented. The malfunction was caused by cracked semiconductor chips in the output silicon-controlled rectifier. Surface contamination in the crack allowed the device to self-gate on and remain on, resulting in a secondary failure of the feedback capacitor.
Citation: (2019). Water/glycol temperature control circuit failed in the automatic mode: Apollo 16. Legacy CDMS. NASA NTRS ID 19730018173. https://ntrs.nasa.gov/citations/19730018173 ↗