MR-01 · Line Maintenance Planning & Execution

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Process Flow Diagram (BPMN)

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L4 Process Steps

Step	Step Name	Role / Swim Lane	System	Input	Output	KPI	Dec?	Exc?
Phase 1 1.1	Retrieve scheduled work orders for inbound aircraft	Line Maintenance Controller	AMOS by Swiss AviationSoftware	Published flight schedule and aircraft tail assignment from Amadeus SkyWORKS	Work pack listing all due scheduled tasks, AD compliance items, and component changes	Work pack issued ≥4 hours before estimated aircraft arrival	N	N
1.2	Load MEL/CDL deferred defect carry-forwards	Line Maintenance Controller	AMOS by Swiss AviationSoftware	Open defect records from previous station's Electronic Technical Log	Annotated work pack with deferred items, MEL interval expiry dates, and required rectification actions	100% of Category B/C MEL items captured before aircraft arrival; zero Category A items carried forward	N	Y
1.3	Confirm parts, tools, and crew availability	Line Maintenance Controller	AMOS by Swiss AviationSoftware	Work pack task list and station inventory snapshot from AMOS stores module	Resource-confirmed work pack or escalation to AOG desk for missing items	Resource confirmation completed ≥2 hours before arrival; parts availability ≥95% for scheduled tasks	Y	Y
Phase 2 2.1	Receive Electronic Technical Log from flight crew	Licensed Aircraft Maintenance Engineer (LAME)	Jeppesen FliteDeck	Completed ETL entries from captain (defects, oil uptakes, cabin reports) transmitted via FliteDeck EFB	Acknowledged defect list with timestamp of handover; open items transferred to AMOS	ETL handover completed within 10 minutes of blocks-on; 100% of defects transferred to AMOS within 15 minutes	N	N
2.2	Categorise open defects by MEL interval and severity	Licensed Aircraft Maintenance Engineer (LAME)	AMOS by Swiss AviationSoftware	Defect entries from ETL handover; MEL/MMEL reference document in AMOS	Prioritised defect list: Category A (immediate), B (3 days), C (10 days), D (120 days)	Defect categorisation completed within 5 minutes of ETL receipt; zero mis-categorisations identified at next audit	N	N
2.3	Assess Category A defects and trigger AOG response	Maintenance Control Centre (MCC) Controller	AMOS by Swiss AviationSoftware	Categorised defect list; FAR Part 43 and airline MOE airworthiness standards	AOG work order raised in AMOS with resource and parts requirements; MCC notified via ACARS/phone bridge	AOG notification to MCC within 5 minutes of Category A identification; AOG rectification plan confirmed within 30 minutes	Y	Y
Phase 3 3.1	Perform exterior walkaround inspection per AMM 05-10	Aircraft Maintenance Technician (AMT)	AMOS by Swiss AviationSoftware	Approved work pack with transit check task cards; AMM Chapter 05-10 inspection criteria	Signed-off walkaround task card in AMOS; new defects raised as open items	Walkaround completed within 15 minutes of blocks-on; defect detection rate benchmarked against fleet average	N	Y
3.2	Service aircraft fluids — fuel, engine oil, hydraulic, LOX	Aircraft Maintenance Technician (AMT)	AMOS by Swiss AviationSoftware	Fuel uplift order from flight dispatch (Jeppesen FliteDeck); oil consumption trend from CAMP	Fluid servicing task cards signed off; uplift quantities logged in AMOS and transmitted to fuel vendor	Engine oil consumption ≤0.3 qt/hr per engine; hydraulic fluid level within limits; LOX quantity per MEL minimum	N	Y
3.3	Complete avionics and safety equipment functional checks	Aircraft Maintenance Technician (AMT)	AMOS by Swiss AviationSoftware	Transit check task card list; crew defect reports referencing avionics squawks	Signed-off avionics check records; unresolved items escalated to LAME for MEL assessment	100% of safety-critical checks (fire detection, ELT, emergency lighting) signed off before departure; zero open avionics items departing without MEL disposition	N	Y
3.4	Verify all turnaround check items signed off	Licensed Aircraft Maintenance Engineer (LAME)	AMOS by Swiss AviationSoftware	Task card completion status from AMT team; turnaround clock from Amadeus Airport Management System	Check completion record in AMOS; ground time extension request if items outstanding	All transit check items signed off ≥10 minutes before scheduled departure; ground time extension rate <5% of transits	Y	Y
Phase 4 4.1	Diagnose defect per AMM/TSM fault isolation procedures	Licensed Aircraft Maintenance Engineer (LAME)	AMOS by Swiss AviationSoftware	Open defect record from ETL; AMM and TSM fault isolation chapters accessed via AMOS document portal	Confirmed root cause; work scope defined; parts demand raised in AMOS	Fault isolation completed within 30 minutes for 80% of line defects; correct-fix-first-time rate ≥92%	N	Y
4.2	Check station stock and raise parts demand in AMOS	Line Maintenance Controller	AMOS by Swiss AviationSoftware	Confirmed parts requirement from LAME; AMOS station inventory snapshot	Parts issued from stock or AOG purchase order raised; estimated delivery time confirmed	Parts issued within 20 minutes for in-stock items; AOG order placed within 15 minutes of stock-out confirmation	Y	Y
4.3	Apply MEL deferral if part unavailable within turn	Licensed Aircraft Maintenance Engineer (LAME)	CAMP by Boeing	MEL/MMEL reference; confirmed parts ETA vs. departure time; defect record in AMOS	MEL deferral entry in CAMP airworthiness tracking; placard installed on aircraft; copy transmitted to MCC	MEL deferral completed and documented within 20 minutes of stock-out decision; deferred defect interval compliance 100% at next station	N	Y
4.4	Verify rectification completed before departure	Maintenance Control Centre (MCC) Controller	AMOS by Swiss AviationSoftware	LAME sign-off notification from AMOS; departure countdown from Amadeus Airport Management System	Rectification confirmed closed in AMOS or deferred via MEL; gate hold issued to operations if incomplete	Rectification confirmed ≥15 minutes before scheduled departure for 90% of defects; gate hold rate due to maintenance <2% of departures	Y	Y
Phase 5 5.1	Perform final inspection and duplicate check if required	Licensed Aircraft Maintenance Engineer (LAME)	AMOS by Swiss AviationSoftware	Completed task cards and rectification records; regulatory requirement for duplicate inspection (CAR 43 / EASA Part-145)	Final inspection sign-off in AMOS; duplicate inspection record if flight control or engine reassembly performed	Duplicate inspection rate 100% for required work scopes; zero departures with open duplicate inspection requirement	Y	Y
5.2	Issue Certificate of Release to Service in AMOS	Licensed Aircraft Maintenance Engineer (LAME)	AMOS by Swiss AviationSoftware	All task cards signed off; no outstanding Category A defects; completed final inspection record	CRS/RTS issued in AMOS with LAME licence number, authorisation scope, and timestamp; aircraft released to operations	CRS issued ≥10 minutes before scheduled departure; 100% of CRS entries include mandatory regulatory fields per Part-145/FAR 43	N	Y
5.3	Update Electronic Technical Log and close open items	Licensed Aircraft Maintenance Engineer (LAME)	Jeppesen FliteDeck	CRS issued in AMOS; rectification and deferral records	ETL updated with all maintenance actions, deferred items, and CRS reference; clean ATL handed to flight crew	ETL closed within 5 minutes of CRS; zero discrepancies between AMOS work order record and ETL at post-flight audit	N	N
Phase 6 6.1	Close all work orders and task cards in AMOS	Line Maintenance Controller	AMOS by Swiss AviationSoftware	LAME sign-off notifications; CRS reference number	All work orders closed with actual man-hours, materials consumed, and defect codes recorded	100% of work orders closed within 2 hours of aircraft departure; man-hour variance vs. estimate ≤15%	N	N
6.2	Log component removals and installations in CAMP	Line Maintenance Controller	CAMP by Boeing	Parts demand fulfilment records from AMOS; component serial and part numbers	Airworthiness record updated in CAMP with installation dates, cycles, and time-since-new for tracked components	100% of life-limited parts (LLPs) and hard-time components logged within 4 hours of installation; zero untracked LLP removals per CAMP audit	N	Y
6.3	Transmit maintenance data to central MRO analytics platform	Line Maintenance Controller	AWS S3 / Redshift	Closed work orders, defect codes, man-hours, and component records from AMOS and CAMP	Maintenance event dataset available in AWS Redshift for reliability analysis, cost tracking, and Tableau dashboards	Data transmission latency <30 minutes post work order closure; data completeness score ≥98% per monthly reliability report	N	N

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Process Attributes

Identification

Process IDMR-01

L1 DomainMaintenance, Repair & Overhaul

L2 ProcessLine Maintenance

L3 NameLine Maintenance Planning & Execution

L4 Steps20 across 6 phases

Decision Gates6 (all with iteration loops)

Exceptions14 documented

Swim Lanes (Roles)

Line Maintenance Controller

Licensed Aircraft Maintenance Engineer (LAME)

Maintenance Control Centre (MCC) Controller

Aircraft Maintenance Technician (AMT)

Systems & Tools

AMOS by Swiss AviationSoftwareJeppesen FliteDeckCAMP by BoeingAWS S3 / Redshift

Key Performance Indicators

Retrieve scheduled work orders for inbound aircraftWork pack issued ≥4 hours before estimated aircraft arrival

Load MEL/CDL deferred defect carry-forwards100% of Category B/C MEL items captured before aircraft arrival; zero Category A items carried forward

Confirm parts, tools, and crew availabilityResource confirmation completed ≥2 hours before arrival; parts availability ≥95% for scheduled tasks

Receive Electronic Technical Log from flight crewETL handover completed within 10 minutes of blocks-on; 100% of defects transferred to AMOS within 15 minutes

Categorise open defects by MEL interval and severityDefect categorisation completed within 5 minutes of ETL receipt; zero mis-categorisations identified at next audit

Assess Category A defects and trigger AOG responseAOG notification to MCC within 5 minutes of Category A identification; AOG rectification plan confirmed within 30 minutes

Perform exterior walkaround inspection per AMM 05-10Walkaround completed within 15 minutes of blocks-on; defect detection rate benchmarked against fleet average

Service aircraft fluids — fuel, engine oil, hydraulic, LOXEngine oil consumption ≤0.3 qt/hr per engine; hydraulic fluid level within limits; LOX quantity per MEL minimum

Airline-Specific Risks & Pain Points

Late schedule changes from network operations can invalidate pre-built work packs; AMOS work order generation requires manual re-trigger when tail swaps occur

ETL records from outstations transmitted via ACARS can arrive incomplete; discrepancies between paper ATL and AMOS electronic record create compliance exposure

Station stock levels for consumables (O-rings, filters, fluids) are often below safety stock due to demand spikes; AMOS min/max reorder logic not consistently tuned per station size

EFB-to-MRO system integration gaps require manual re-keying of defects into AMOS at some stations, introducing transcription risk and adding 10–15 minutes to turnaround

Engineers at outstations may lack current AMM/MEL revision; AMOS does not auto-flag MEL revision mismatches between aircraft effectivity and loaded document version

MCC visibility of real-time station technician availability is limited; AOG coordination relies on phone bridge rather than integrated workforce management, causing delays during high-disruption events

Inputs / Outputs

Primary InputPublished flight schedule and aircraft tail assignment from Amadeus SkyWORKS

Primary OutputMaintenance event dataset available in AWS Redshift for reliability analysis, cost tracking, and Tableau dashboards

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