# SDR DHL9672038C

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 24, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N720DH
- Make and model: Boeing 727228
- Aircraft serial: 19544
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Plenum Chamber
- Condition: Corroded
- Location: Right
- 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/DHL9672038C

## Discrepancy

AT C-CHECK, CORROSION WAS FOUND ON UPPER WALL OF RAM AIR PLENUM CHAMBER OVER PRIMARY HEAT EXCHANGER.  REMOVED HEAT EXCHANGER FOR ACCESS, REMOVED EXISTING DOUBLER, INSTALLED REPAIR PER ENGINEERING ORDER  PMSI-135D-1.  INSTALLED DOUBLER 15 BY 3.75, DOUBLER 19.5 BY 6.5, TRIPLER 24 BY 6.5 .  INSTALLED FIBERGLASS REPAIR PER SRM 51-40-8 ON RAM AIR DUCT.  INSTALLED L-ANGLE PER SRM 51-20-4.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.