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15 - Landing Gear

United Airlines currently operates over 1,100 737, 757, and 767 aircraft that use a parking brake valve (P/N 341525-1) supplied by Whittaker Controls. This part has a mean time between failures of 21,005 hours but 120 units failed in the last 24 months, resulting in 45 flight delays and 4 cancellations. The top failure found is internal leakage when the parking brake is set. United asks if other operators are seeing similar issues and whether any improvements can improve the part's reliability.

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103 views2 pages

15 - Landing Gear

United Airlines currently operates over 1,100 737, 757, and 767 aircraft that use a parking brake valve (P/N 341525-1) supplied by Whittaker Controls. This part has a mean time between failures of 21,005 hours but 120 units failed in the last 24 months, resulting in 45 flight delays and 4 cancellations. The top failure found is internal leakage when the parking brake is set. United asks if other operators are seeing similar issues and whether any improvements can improve the part's reliability.

Uploaded by

郝帅
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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REFERENCE 21-023/MSG-367 - Page 67

LANDING GEAR

Item Summary Title LRU PN Vendor Aircraft ATA From

78 737 Parking Brake 341525-1 Whittaker Corp Whittaker 737 UAL


Valve Reliability Controls Div
757
767

United Airlines currently operates ~1132 units P/N 341525-1. The current MTBUR for the units is 21005 Hours.
In the last 24 months, 120 units have been removed. This issue has caused 45 delays and 4 cancellations across
the 737,757,767 fleet. Internal leakage is the top failure finding in the shop. Top symptom is pressure bleed down
when parking brake set.

Questions:
1. Are other Operators seeing similar issues?
2. Is there any component improvements to improve the reliability of this unit?

Item Summary Title LRU PN Vendor Aircraft ATA From If MRO, the
Associate
Airline

79 IPL mistake AC30-0028 Esterline B777 32-42 AFR-KLM AFR


Autobrake Switch
Auxitrol

In Oct 2020, AFI sent a noticed to Esterline about a mistake in CMM 32-42-02 IPL. Air France observed several
items have the same MPNs but items are different parts.

Printed text on each item is different (see picture: A1 A2 A3… on one


item, B1 B2 B3… on other item), so this situation creates a confusion
during reassembly.

Esterline needs to correct this issue in the CMM. What is Esterline


schedule to update the CMM?

Other Operators, Esterline, Boeing comment please.


REFERENCE 21-023/MSG-367 - Page 68

LANDING GEAR

Item Summary Title LRU PN Vendor Aircraft ATA From If MRO, the
Associate
Airline

80 Pitch Trimmer
10-359303-001 Safran A350 32 AFR-KLM AFR
Actuator
Lock Stay Actuator 10-359501-000
Retraction Actuator 10-359703-000

Many piece parts of the above listed aircraft components are listed in the IPL of these components (CMM 32-31-
94; 32-31-93; 32-31-91) and are supposed to be procurable.

Beginning in 2019 it has not been possible to get a Request for Quotation from the OEM Safran, either a price or
lead time. Despite the same request in AMC 2020, Safran has yet to provide the quotation of the piece parts by
the end of 2020.

Safran, can you please fix this issue and allow these piece parts to be procurable?

Safran, Airbus comments please.

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