L PACK FAIL
(Caution)

Left Pack is defective.

• Anti-Icing Pressure Sensor 1 (MT64)/Pack Discharge Pressure Sensor (PDPS)
• Air Conditioning System Controller 1 (ACSC) (A87)
• Air Cycle Machine (ACM)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter:

• Customer Forum-Newsletter 2016-01-05 Volume 13 issue 1 - Air Conditioning System - Intermittent "L-R Pack Fault" - Crew Alerting System (CAS) Messages

Flight Operation Notifications Manual (FONM): None

NOTES:

• Left (L) Pack Pushbutton of the Bleed-Air Control Panel is not set to the OFF position and Pack inlet pressure is above the Flow Control Valve (FCV)  threshold to open and FCV is failed closed and Torque Motor current of the FCV is below 10 mA
• There is a double channel failure sensed
• Compressor discharge temperature is above 230°C (446°F) for 10 seconds
• Pack inlet temperature is above 260°C (500°F) for 30 seconds (when on Auxiliary Power Unit (APU) bleed conditions)
• Pack inlet temperature is above 232°C (450°F) for 30 seconds (when on Engine bleed conditions)
• Pack inlet temperature is above 260°C (500°F) for 10 seconds (when on APU bleed conditions)
• Pack inlet temperature is above 260°C (500°F) for 10 seconds (when on Engine bleed conditions)
• There is a Compressor discharge overheat (above 260°C (500°F) for 10 seconds) due to a defective Air Cycle Machine or to a loss of ventilation from the Ram Air Heat Exchanger
• Pack Discharge Duct is disconnected or the temperature is above 90°C (194°F) for 40 seconds and the L, Right (R) Manual (MAN) Temperature (TEMP) Pushbutton on the Bleed-Air Control Panel is not set to the MAN position
• FCV is not closed and pack discharge pressure is below -1.54 psig (-10.62 kPa) for 10 seconds.

1. Using CAIMS, access View Fault Messages/View Service Messages.
2. Select related CAIMS message below:
   Select the CAIMS Message:2161318ECS - [ACSC1-A] LH FAN AIR VLV CMD /WRG2161321ECS - [ACSC1-A] LH FLOW CONT VLV CMD/FCV2161514ECS - [ACSC1-A] LH PACK INLET OVERHEAT2161515ECS - [ACSC1-A] LH COMPRESS DIS OVERHEAT2161516ECS - [ACSC1-A] LH PACK DISCH OVERHEAT2161519ECS - [ACSC1-A] LH PCK DIS UNDERPRESSURE2162321ECS - [ACSC1-B] LH FLOW CONT VLV CMD /FCV2162514ECS - [ACSC1-B] LH PACK INLET OVERHEAT2162515ECS - [ACSC1-B] LH COMPRESS DIS OVERHEAT2162516ECS - [ACSC1-B] LH PACK DISCH OVERHEAT2162519ECS - [ACSC1-B] LH PCK DIS UNDERPRESSURE

   1. If no CAIMS fault message are present, continue with next step.

3. Inspect ACM PDPS port for obstruction. The opening should be round.
   NOTE: When checking sense lines, ensure there are no cracks, nicks, scores or scratches on the contact surface of the couplings and that the couplings were properly torqued. It only takes a few drops of water to cause a problem. To purge the lines, they can be blown out with Nitrogen after removing the sensors.
   
4. Make sure that the PDPS pressure ports (three 0.052” dia. holes) are not covered by the supporting clamp installation.
   
5. Check the following lines and drains for damage or blockage: Air Cycle Machine (ACM) turbine, compressor, water extractor, water nozzle and PDPS Sense Line Drain (the Drain was introduced at aircraft 9270 and Subs).
6. Do close out.