# SDR DALA2019070904173

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2019
- Submitted: July 12, 2019
- Operation: Air carrier
- Aircraft: N535US
- Make and model: Boeing 757251
- Aircraft serial: 26482
- Aircraft time: 76,106 hours, 24,567 cycles
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Oxygen Mask
- Condition: Malfunctioned
- Location: Cabin
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2019070904173

## Discrepancy

(AIRCRAFT 5635, L/P 5962123) 02 MASKS AT 17 A-C DID NOT DEPLOY DURING DECOMPRESSION EVENT. 4L LAVATORY AND 4R LAVATORY DIDNT DEPLOY ALSO. REPACKED 02 MASKS PER CARD 3520-3004 STEP 1, PERFORMED MASK DROP PER AMM 35-21-00 OPS CHECK GOOD.

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