1. AH-64E System-Level Embedded Diagnostics (SLED)
RAM7 Conference November 2014
Derek S. Fok
Supportability Engineering
Apache Programs
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2. SLED-STAMP Integrated Product Team
DEREK
System-Level Embedded Diagnostics
Smart Tool 4
Aviation Maintenance Picture
SLED-STAMP is the result of a successful government and industry partnership.
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3. Maintenance Concept of Operations (CONOPS) driven design
Why SLED-STAMP?
Problem = Lack of Maintenance Situational Awareness
Solution = Real Time “TOOL” = SLED-STAMP
Maintenance planning (P4T2) based on real-time, over-the-air fault reports
Improved accuracy and consistency in fault reporting
Provides Maintenance Production Control with useful planning data
Reduces troubleshooting time; potential increases in availability
DEREK
Maintenance Concept of Operations (CONOPS) driven design
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4. What data does the SLED Report provide?
Power-up date/time: for linking to ULLS-A and MDR data
Location data: critical for planning DART missions
Aircraft tail number: for identification of reporting aircraft
In-air status: shows aircraft as in-air/on the ground at time of message
SLED Results: Fault isolation to the line replaceable unit (LRU)
WCAs/Faults/Exceedances: Crew station data filtered for maintenance relevant information (ie, suppressed COM and NAV advisories)
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5. SLED Report Auto-Transmit Cases
SLED – Auto
SLED – Flight
Takeoff / Landing
SLED – Mayday
SLED - Manual
Trigger
SLED Report data posted = New
Upon Aircraft Take-off/Landing
MAYDAY = Send
(EMER XPNDR or Manual)
MAIL SLED Report = Operator Send
Checks
TI ready
Valid recipients loaded
Aircraft is in the air
Transition from ground-to-air or air-to-ground -  -
Auto-transmit enabled
SLED Report Recipients
EXAMPLES
Maintenance
DART C2
OTHER
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6. STAMP FOT&E Prototype Production Control Display
ERIC??
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7. STAMP Future Interfaces
PC Dashboard
Mobile App
Active Report View
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8. Improvements to Maintenance Situational Awareness
Better on-board data
Processing is on mission processors = no additional hardware
Discriminates between primary and secondary fault indications
Uses fault patterns to isolate faults to the line replaceable unit (LRU)
Fault patterns and fault correlations are based on a data table that can be updated between aircraft software releases
Improving the reported data
Reporting uses existing Apache BFT hardware for non-line of sight reporting
Reporting uses a data table based filter that prevents non-maintenance warning, caution, advisory (WCA), and fault codes from causing reports
New maintenance tools
STAMP ground software runs on standard Windows PCs, interfacing to existing USG FBCB2/JBC-P hardware
STAMP GUI interface uses SLED Reports to provide maintenance users with near real-time information about where the aircraft is and what faults and WCAs the pilot is seeing
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9. SLED future enhancements
Sensor upgrades to improve data quality and fidelity.
SLED Mission Processor Architecture
Data analytics to support real-time, on-board fault isolation.
SLED is the on-ramp for future diagnostic and prognostic improvements, providing capabilities for real-time, on-board processing, storing, and reporting maintenance data.
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