- Difficulty date
- April 22, 2023
- Submitted
- April 24, 2023
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36355
- Aircraft time
- 33,550 hours, 10,636 cycles
- Part
- Plenum
- Part number
- 22156292
- Condition
- Broken
- Location
- Right Ecs Bay
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAT EXCHANGER RESTORATION, FOUND PRIMARY HEAT EXCHANGER R/H PLENUM/DIFFUSER PANEL WITH TWO NUTPLATES MISSING AND DIFFUSER BROKEN. GROUNDED - YES. REMOVED PRIMARY RH HEAT EXCHANGER AND PLENUM/DIFFUSER IAW B737-900 AMM 21-51-03-000-805-002. REPLACED DAMAGED PRIMARY, DIFFUSER PORTION HAD NO DEFECTS NOTED. REF B737-900 AMM 21-51-03-400-804-002. LEAK CHECK GOOD. OPERATIONAL CHECK GOOD.