Line Replaceable Units
LRU and LRP processes for on-wing, off-wing, and exchange services
Definitions
LRU
Line Replaceable Unit - an item supplied by a Rolls-Royce vendor that can be removed on the line and as listed in the TotalCare Services Agreement.
LRP
Line Replaceable Part - all Parts (excluding LRUs, industry standard parts without RR part numbers, and any item of EBU) that can be removed on the line.
- Provide the Customer with a LRU/LRP availability Service Level Guarantee at Main Base (LRU amendment 1)
- Provide to the Customer an agreed level of Initial Provisioning to support the Customer's operation of Aircraft
- Define the list of LRU/LRPs that are repairable and not repairable
Repair Order Information Required
Unit is to be reworked in accordance with vendor CPM/CMM Modification standard
"This is a ROLLS-ROYCE LRU/LRP MANAGEMENT UNIT"
Ship to address
Engine Serial Number
Date of unit removal
Unit Part Number
Unit Serial Number
Unit hours and cycles since new
Unit hours and cycles since repair or Overhaul
Detailed Reason for Removal
Maintenance Message where applicable
Confirmation that all necessary troubleshooting was carried out
Details of any other Assets removed as part of troubleshooting
Exchange RO Information Required
LRU Management Service — the following must be included in Repair Orders for exchange units:
Clear labelling that "this is a ROLLS-ROYCE LRU MANAGEMENT UNIT"
Part Number
Serial Number
Time Since New
Time Since Overhaul
Cycles Since New
Cycles Since Overhaul/Refurbishment
Detailed reason for removal
Engine Type
Engine Serial Number
Aircraft Tail Number
Date of LRU removal from engine
Ship to address
No Fault Found (NFF) Rate Monitoring
The NFF rate will be reviewed monthly. If the NFF rate is above 15%, Rolls-Royce and the Customer will review troubleshooting procedures with a view to reducing NFF rates. LRU Removals are reviewed during quarterly Business Review Meetings.
LRU Shortage & Beyond Economic Repair
Shortage Management
The OHB will aim to return the same unit to the Engine. If an LRU is not available at kitting, the OHB seeks assistance via the RR OBM, who reviews options with AST, Customer, and LRU Management team.
Beyond Economic Repair
If an LRU is deemed beyond economic repair, the RR OBM will agree replacement options with the RR AST, Customer, and LRU Management team as appropriate.
Exchange Timelines
RO Raised
Within 24 hrs of RR acknowledgement
Non-Main Base RO
Within 72 hours
Pack & Ship
Within 48 hrs of RO
Exchange LRU Delivery
Within 14 days
Exchange LRU Documentation
Rolls-Royce provides the following for every Exchange LRU:
- EASA Form 1 and/or FAA form 8130
- Part Number & Serial Number
- TSN, TSO, CSN, CSO
- Reason for last removal + shop visit report
NFF Threshold
No Fault Found rate above 15% triggers a joint review of troubleshooting procedures. Reviewed at quarterly BRMs.
Abbreviations
Pro Tip
Include all 13 required data points on every Repair Order to prevent processing delays. Ensure thorough troubleshooting before removal to keep NFF rates below the 15% threshold.