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Alert Details

Recovery Plan

Southwest 737-800 at KSTL is held after the left air data inertial reference unit failed to align during preflight. IRS FAULT L is latched with no dispatch relief for the scheduled departure, requiring an ADIRU replacement, avionics support, and next-flight-out logistics.

Alert Details

Alert type: AOG Alert
Added to platform: 29SEP26 0914Z
Aircraft model: Boeing 737-800
Aircraft series: Not specified
Engine model: CFM56-7B
ICAO location: KSTL
Impact type: Revenue PAX
MX window opens: 29SEP26 0840Z
RTS target: 30SEP26 1400Z
Wanted items: 4
Alert specifics: Unscheduled Maintenance
Airworthiness Directive (AD): Not specified
Service Bulletin (SB): Not specified
Check: Not specified
ATA 100 CHAPTERS: 34Navigation
Short fault name: Left ADIRU align failure, IRS FAULT L
Error / fault indications: IRS FAULT L light illuminated and ALIGN light flashing on the IRS mode select panel. Left IRS will not complete alignment after two power cycles.
Troubleshooting status: Troubleshooting Complete - All required Items listed
TSM/FIM reference: Not specified
Roles and responsibilities: Southwest MCC coordinates parts sourcing and aircraft release. Line avionics technician performs ADIRU removal, installation, and alignment check. Courier provider delivers the replacement unit to the Terminal 2 ramp.

ITEMS

Items in this alert

4 items

Parts & Rotables · WANTED

HG2050AC05 - Left air data inertial reference unit, ADIRU

Item Id: DG3C7

Serviceable ADIRU compatible with 737NG air data and inertial reference system, BITE clean and preserved for installation.

Aircraft / Family: Boeing
ATA 100 CHAPTERS: 34Navigation
Required: 29SEP26 2200Z
Quantity: 1

Added to platform: 29SEP26 0916Z

DetailsClose

ITEM WORKFLOW

Item basics

Item Type: Parts & Rotables
Wanted / Available: Wanted
Item Title: Left air data inertial reference unit, ADIRU
Sales Copy: Serviceable Honeywell ADIRU for 737-800 left IRS replacement, available for AOG dispatch to KSTL with trace and FAA release.

ITEM DETAILS

Technical specifications

P/N / IPC REF: HG2050AC05
ALT P/Ns: HG2050AC04
Description: Serviceable ADIRU compatible with 737NG air data and inertial reference system, BITE clean and preserved for installation.
Rev or Version: Mod 11
Quantity: 1
ACCEPTABLE MANUFACTURER(s): Honeywell Aerospace
Manufacturer Type(s) Considered: OEM
Trace Required: OEM trace
Required Onsite D/T Z: 2026-09-29 22:00Z
Onsite Location Type: Ramp
ATA 100 CHAPTERS: 34Navigation
Acceptable Release Documentation / Tag: FAA Form 8130-3

APPLICABILITY & CONDITION

Applicability and condition

Conditions Considered: Not specified
AIRCRAFT MODEL(s): Boeing 737-800
ENGINE MODEL(s): Not specified

TERMS

Terms

Purchase Type(s) Considered: Outright Purchase
Warranty Required: No
Warranty Terms: Not specified
Shipping (Incoterms): DAP

Logistics & Customs · WANTED

Next-flight-out courier to KSTL

Item Id: PCQW4

Arrange next-flight-out transport of the replacement ADIRU to KSTL with priority handling, live tracking, and tail-side delivery to Gate E28.

Aircraft / Family: Boeing 737-800
ATA 100 CHAPTERS: 34Navigation
Required: 29SEP26 2200Z
Location: KSTL

Added to platform: 29SEP26 0919Z

DetailsClose

ITEM WORKFLOW

Item basics

Item Type: Logistics & Customs
Wanted / Available: Wanted
Item Title: Next-flight-out courier to KSTL
Sales Copy: Next-flight-out courier for AOG ADIRU shipment to KSTL with tail-side delivery.

ITEM DETAILS

Technical specifications

Description: Arrange next-flight-out transport of the replacement ADIRU to KSTL with priority handling, live tracking, and tail-side delivery to Gate E28.
Required Onsite D/T Z: 2026-09-29 22:00Z
Onsite Location Type: Ramp
ATA 100 CHAPTERS: 34Navigation

APPLICABILITY & CONDITION

Applicability and condition

Conditions Considered: Not specified
AIRCRAFT MODEL(s): Not specified
Aircraft Model: Boeing 737-800
ENGINE MODEL(s): Not specified

Maintenance Services · WANTED

Avionics technician onsite, FAA A&P

Item Id: C9CMA

Provide an FAA A&P technician with 737NG avionics experience for ADIRU removal and installation, connector inspection, IRS alignment, and return-to-service checks.

Aircraft / Family: Boeing 737-800
ATA 100 CHAPTERS: 34Navigation
Required: 29SEP26 2200Z
Location: KSTL

Added to platform: 29SEP26 0917Z

DetailsClose

ITEM WORKFLOW

Item basics

Item Type: Maintenance Services
Wanted / Available: Wanted
Item Title: Avionics technician onsite, FAA A&P
Sales Copy: FAA A&P avionics technician onsite at KSTL for 737-800 ADIRU replacement and IRS alignment support.

ITEM DETAILS

Technical specifications

Description: Provide an FAA A&P technician with 737NG avionics experience for ADIRU removal and installation, connector inspection, IRS alignment, and return-to-service checks.
Required Onsite D/T Z: 2026-09-29 22:00Z
Onsite Location Type: Ramp
ATA 100 CHAPTERS: 34Navigation

APPLICABILITY & CONDITION

Applicability and condition

Conditions Considered: Not specified
AIRCRAFT MODEL(s): Not specified
Aircraft Model: Boeing 737-800
ENGINE MODEL(s): Not specified

Testing & Certification · WANTED

Bench check and certification of removed ADIRU

Item Id: GAV4D

Bench check the removed ADIRU, document fault findings, and return with FAA Form 8130-3 or report findings for repair quote.

Aircraft / Family: Boeing 737-800
ATA 100 CHAPTERS: 34Navigation
Required: 02OCT26 1500Z
Location: KSTL

Added to platform: 29SEP26 0918Z

DetailsClose

ITEM WORKFLOW

Item basics

Item Type: Testing & Certification
Wanted / Available: Wanted
Item Title: Bench check and certification of removed ADIRU
Sales Copy: Approved avionics repair station to evaluate and certify the removed 737NG ADIRU after replacement.

ITEM DETAILS

Technical specifications

Description: Bench check the removed ADIRU, document fault findings, and return with FAA Form 8130-3 or report findings for repair quote.
Required Onsite D/T Z: 2026-10-02 15:00Z
Onsite Location Type: Other
Other Location Type: Approved avionics repair station near KSTL
ATA 100 CHAPTERS: 34Navigation

APPLICABILITY & CONDITION

Applicability and condition

Conditions Considered: Not specified
AIRCRAFT MODEL(s): Not specified
Aircraft Model: Boeing 737-800
ENGINE MODEL(s): Not specified

OPERATIONAL CHANGES

Alert status updates

No visible status updates have been posted.

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Alert Details

Alert type

AOG Alert

Added to platform

29SEP26 0914Z

Aircraft model

Boeing 737-800

Aircraft series

Not specified

Engine model

CFM56-7B

ICAO location

KSTL

Impact type

Revenue PAX

MX window opens

29SEP26 0840Z

RTS target

30SEP26 1400Z

Wanted items

Alert specifics

Unscheduled Maintenance

Airworthiness Directive (AD)

Not specified

Service Bulletin (SB)

Not specified

Check

Not specified

ATA 100 CHAPTERS

34Navigation

Short fault name

Left ADIRU align failure, IRS FAULT L

Error / fault indications

IRS FAULT L light illuminated and ALIGN light flashing on the IRS mode select panel. Left IRS will not complete alignment after two power cycles.

Troubleshooting status

Troubleshooting Complete - All required Items listed

TSM/FIM reference

Not specified

Roles and responsibilities

Southwest MCC coordinates parts sourcing and aircraft release. Line avionics technician performs ADIRU removal, installation, and alignment check. Courier provider delivers the replacement unit to the Terminal 2 ramp.