C-130 L/ESS Program James McCall Lockheed Martin Aeronautics - Marietta

C-130 L/ESS Program
James McCall
Lockheed Martin Aeronautics - Marietta
C-130 Structures Technology – Operational Loads
Phone: (770) 494-8420
Facsimile: (770) 494-9610
E-mail: [email protected]
What is a “L/ESS”
Program
• L/ESS = Loads/Environment Spectra Survey
• Purpose:
– To establish through the acquisition, processing, reduction, and
analysis of recorded stress and loads-related data during actual
aircraft operations, the baseline loading experience
– To validate analytical tools used to establish life of aircraft
components
*** Allows User to Better Understand and Track the Usage of Their
Aircraft and to Establish Adequate Maintenance/Repair Procedures ***
L/ESS History
• Legacy: Past USAF C-130 Loads Recording Efforts
– LHRP - Life History Recording Program (70’s)
VGH program used to define aircraft loading environments.
– SMLRP - Severe Missions Loads Recording Program
Early 80’s program to investigate severity levels of new mission
types.
– L/ESS 1 - Loads/Environment Spectra Survey
Instrumentation and Processing System designed in late 80’s, but
only installed on a prototype aircraft for a limited verification
period. Design and Development Limited by Recording System
Memory Limitations.
L/ESS – Why Now
• MIL-HDBK-1530C provides guidance that each MDS (or Usage type)
have sufficient number of aircraft instrumented such that 20% of the
data is collected
• Currently no in-service Legacy C-130 is instrumented for L/ESS
• C-130Js record Nz data which can be used to determine environment
but have no strain gages to determine actual local loads/stresses
Current L/ESS Program
• Warner Robins 330th ACSG Contracted LM Aero to Develop a Technical
Data Package (TDP) for an AC-130U Aircraft – October 2007
• Warner Robins 330th ACSG Contracted LM Aero to Develop a Technical
Data Package (TDP) for a standard C-130 Aircraft – October 2009
– TDP to be based upon effort for AC-130U
• First Part of Program (Task I) in process, to be completed Jan 2011
• Task I to develop TDP and purchase Data Acquisition Unit
• Task II to Install TDP (stain gages and LRUs)
– Task III to calibrate aircraft and collect data (yet to be quoted)
L/ESS Program – Data Parameters
Overview
 Data and Instrumentation Package
 Documentary Flight Data
 Operational Parameters
 Discrete Switches
 Accelerometers
 Strain Gages
 Load Bridges
 Control Surface Position Transducers
 Instrumentation – Historical Correlation
 Operational Parameters
 Response Parameters
L/ESS Program – Data Parameters
Data and Instrumentation Package
• Documentary Flight Data
– Gross Weight (GW)*
– Air Drop Weight (ADW)*
– Wing Fuel Weight (WNGFWT)*
* To be obtained from AIRCAT along with associated times
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Operational Parameters
– Calibrated Airspeed (VA)
– Pressure Altitude (ALTP)
– Radar Altitude (RALT)
– Ground Speed (VG)
– Heading Azimuth (HEAD)
– Bank Angle (BANK)
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Operational Parameters (continued)
– Pitch Angle (PH)
– Yaw Angle (YW)
– Roll Rate (ROLL)
– Yaw Rate (YAW)
– Pitch Rate (PITCH)
– Cabin Differential Pressure (CABDP)
– Fuel Weight Total (FW) and by Tank (FW1, FW2, FW3… FW8)
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Discrete Switches
– Weight On Wheels (WOW)
– Ramp Door Open (RAMP)
– Cargo Door Open (CARGD)
– Aerial Refueling Connect (ARC) - if available
– Airdrop Green Light (ADP)
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Accelerometers
– Vertical and lateral acceleration at the nominal Center of Gravity
(Nzcg, Nycg)
– Wing accelerations (Nz) [3 locations]
– Nacelle (Nx, Ny, Nz)
– Horizontal Stabilizer (Nz)
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Strain Gages
– Wing stresses [11 locations]
– Engine Truss stresses [2 locations]
– Fuselage stresses [2 locations], loads [2 locations]
– Empennage stresses [2 locations]
• Horizontal Stabilizer stress
• Vertical Stabilizer stress
L/ESS Program – Data Parameters
Data and Instrumentation Package (cont’d)
• Loads Bridges
– 4 Bridge locations: 3 left wing, 1 right wing
– Each Bridge records Sz, Mx & My
• Control Surface Position Transducers
– Flap (DELF): will use existing transducer
– Aileron (DELA)
– Elevator (DELE)
– Rudder (DELR)
L/ESS Program – Data Parameters
VSS 23 Stress
FS 630 BL 61 Mz
HSS 80 Nz, Stress
Nycg, Nzcg
FS 630 BL 20 My
FS 672 BL 20
Stress
WS 61 Stress
WS 70 Stress
WS 95 Sz, Mx, My
WS 95R Sz, Mx, My
WS 220 Sz, Mx, My
WS 229 Stress
WS 254 Stress
WS 357 Nz,
Sz, Mx, My
FS 475 Stress
WS 518 Stress
WS 518 Nz
WS 782 Nz
Nacelle Nx, Ny, Nz, Stress
L/ESS Program – Current Schedule
ECP 10-00126 USAF WR L/ESS Task 2 Support Program
4th Qtr
2010
Task
Contract Award
Final Assembly
TK Installation
Functional Checkout
Redline Changes
Final TDP
3rd Qtr
2011
4th Qtr
2011
1st Qtr
2012
5/12
11/18
10/4
1/13
TK Development / Integration &
10/4
Validation
Wire Harness Fabrication
2nd Qtr
2011
10/4
Technical Interchange Meetings
Calibration Plan
1st Qtr
2011
2/22
12/9
5/6
5/9
6/3
6/27
7/20
10/31
10/21
11/28
2/27
2/28
3/28