MOM-MOM-26-0091-01B
14-Day Normal Parking Extension Guidance
For 737 MAX:
At Day 1: Perform 737 MAX TASK 10-11-01-580-801 Airplane Parking and disconnect the main/auxiliary
batteries and fuel spar valve battery.
– If the airplane is parked in a Severe environment as detailed in AMM 49-11-00 Refer to APU
preservation Task 49-11-00-600-802 to protect the APU.
At Day 7: Do these additional steps:
– Check that the pitot probes static ports AOA vanes and TAT probe coverings are secure and intact
– Monitor humidity (do additional steps to control humidity if greater than 70%: APU runs every 3 days,
desiccants, etc)
– Drain water from fuel tank sumps (every 3 days if parked in a humid environment)
– Examine tire pressure
– Connect and charge main/auxiliary batteries and fuel spar valve battery to full
– Operate the APU and engines
– Operate the air conditioning packs for the duration of the engine run
– Exercise primary/secondary flight controls
– Disconnect the main/auxiliary batteries and fuel spar valve battery.
At Return-to-Service (day 8 up to day 14): Do these additional steps
– Perform 737 MAX AMM TASK 10-11-01-580-802 – Return Airplane to Service After Parking
– Perform Pitot Probe – Detailed Inspection TASK 34-11-01-200-801; if FOD is found in a probe then
perform Pitot Static System – Flushing TASK 34-11-00-170-802 for the applicable pitot system
– Perform Static Port – Detailed Inspection TASK 34-11-02-200-801; if FOD is found in a port then
perform Pitot Static System – Flushing TASK 34-11-00-170-802 for the applicable static system
– Perform Elevator Pitot-Probe – Inspection TASK 27-31-17-200-802; if FOD is found in the probe then
perform Elevator Pitot-Static System – Flushing TASK 27-31-17-170-801 for the applicable pitot system
– Manually cycle the PRSOV and HPSOV 3 times
– Check fuel vents
– Check structural drains
– Check the airplane exterior; look for damage corrosion bird or insect nests etc
– Examine tire pressure
– Clean and check LG Struts (Check if within the service band)
– Connect and charge main/auxiliary/fuel spar valve batteries
– Make sure that all systems are operational (If a system has been modified/replaced during parking the
applicable operational test should be done. If no systems were modified then a check for flight deck
effects or faults is a sufficient check that systems are operational.)
– Exercise the primary/secondary flight controls: look for anomalies (leaks fault codes etc).For 737 NG:
At Day 1: Perform 737NG Task 10-11-01-580-801 Airplane Parking with pitot static covers installed as
soon as possible.
– Disconnect the Main/Aux batteries and spar valve batteries.
– If the airplane is parked in a Severe environment as detailed in AMM 49-11-00 Refer to APU
preservation Task.
At Day 7: Do these additional steps:
– Check that the pitot probes static ports AOA vanes and TAT probe coverings are secure and intact
– Monitor Humidity (do additional steps to control humidity if greater than 70%: APU runs every 3 days,
desiccants, etc)
– Drain water from fuel tank sumps (every 3 days if parked in a humid environment)
– Examine Tire pressure
– Connect and charge Main/Aux batteries and spar valve batteries to full
– Operate the APU and engines
– Operate the air conditioning packs for the duration of the engine run
– Exercise Primary/Secondary Flight controls
– Disconnect the Main/Aux batteries and spar valve batteries.
At Return-to-Service (Day 8 up to Day 14): Do these additional steps:
– Perform 737AMM Task 10-11-01-580-801 – Step – Put the Airplane Back In Its Usual Condition for
Return to Service
– Manually cycle the PRSOV and High Stage Valve (HSV) 3 times
– Perform Pitot Probe – Detailed Inspection TASK 34-11-01-200-804; if FOD is found in a probe Perform
Pitot Static System – Flushing TASK 34-11-00-170-802 for the applicable pitot system
– Perform Static Port – Detailed Inspection TASK 34-11-02-200-803; if FOD is found in a port perform
Pitot Static System – Flushing TASK 34-11-00-170-802 for the applicable static system
– Perform Elevator Pitot-Probe – Inspection TASK 27-31-17-200-802; if FOD is found in the probe Perform
Elevator Pitot-Static System – Flushing TASK 27-31-17-170-801 for the applicable pitot system
– Check fuel vents
– Check Structural drains
– Check the airplane exterior: look for damage corrosion bird or insect nests etc
– Examine Tire pressure
– Clean and check LG Struts (Check if within the service band)
– 5th stage check valve should be inspected per AD 2020-16-51
– Connect and charge Main/Auxiliary/Fuel Spar Valve batteries
– Make sure that all systems are operational (If a system has been modified/replaced during parking the
applicable operational test should be done. If no systems were modified then a check for flight deck
effects or faults is a sufficient check that systems are operational.)
– Exercise the Primary/Secondary Flight controls: look for anomalies (leaks fault codes etc).