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Abnormal Occurrence 50-289/75-33:on 750917,de-ice makeup valve NR-V-4A failed in open position.Failure caused by high resistance contact in closing control circuit not fully energizing.All control contacts to be checked & cleaned.

Accession Number: ML19210A242

Date Released: Monday, August 12, 2019

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• ML19210A241 - Abnormal Occurrence 50-289/75-33:on 750917,de-ice makeup valve NR-V-4A failed in open position.Failure caused by high resistance contact in closing control circuit not fully energizing.All control contacts to be checked & cleaned. (4 page(s), 9/26/1975)
• ML19210A245 - Abnormal Occurrence 75-33 re failure of de-ice makeup valve NR-V-4A to close using control room remote pushbutton.Caused by high resistance contact in closing control circuit. Contact cleaned,tested & returned to svc. (1 page(s), 9/19/1975)