# SDR 99ZZZX2539

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 18, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Duncan Aviation Inc, repair station JGVR194F](https://openairdocs.org/faa-repair-station/JGVR194F/duncan-aviation-inc.md) (OpenAirDocs)
- Aircraft: N273MC
- Make and model: Lear 55LEAR
- Aircraft serial: 119
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Oxygen Masks
- Part number: C3512000
- Condition: Failed
- Location: Cabin
- Component: Puritanbenet
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX2539

## Discrepancy

INSPECTED CABIN OXYGEN MASKS IN C/W AD 99-08-21.  FOUND FIVE CABINS OXYGEN MASKS WITH CURE DATES FROM 1983 TO 1991 TO BE TORN.  AD 99-08-21 REFERS TO OXYGEN MASKS WITH CURE DATES FROM SEPTEMBER, 1993 TO MARCH, 1997.  THIS AD SHOULD REQUIRE THAT ALL OXYGEN MASKS BE INSPECTED FOR THIS DEFECT.

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