C-130/T56
TD Amplifier UPGRADE
ABB, Inc., in partnership with D&D Enterprises, LLC, introduces the
TD Amplifier - the sole-source upgrade for the Series II/III Rolls-Royce T56 Engine. The design delivers increased reliability and safety, simplified maintenance, and reduced life-cycle costs.
TD AMP Drop-In Replacement
50% less Depot Level MX
Already in use by 14 operators, including USAF
• Replaces all Series II/III TD AMPs
(Round or Square)
Old Square TD AMP
• Potentiometers with no reference dial or stops
• Increased MX costs & reduced aircraft readiness due to field adjustment errors
Enhanced Reliability Model
• DROP-IN REPLACEMENT for all Series II/III TD AMPs (Round or Square)
• Compliant with US Air Force Recommendations for Improved Safety
• BIAS knob has been plugged
• Slope knob has become a Temp selector between 971C & 1077C
• Norm knob has become the Slope Adjustment ± 20˚
• Start knob has been plugged
KEY BENEFITS
Improved Safety & Reliability
Eliminates uncommanded engine power rollback with a low-voltage immunity circuit reliable down to 35VAC. Already in service with 14 operators, including the USAF, and compliant with USAF safety recommendations.
Simplified Field Adjustments, 50% Fewer Repairs
Fool-proof slope adjustment (±20° on 971°C/1077°C settings) replaces manual BIAS and Start knobs entirely — cutting repair costs and downtime by half while reducing field-adjustment errors.
TD AMPLIFIER
PN: 23089510 /NSN 5996-01-628-4657
INTERCHANGEABLE
with the following Part Numbers:
5502636-4
179822-1
6842553
6870095
543681-1
839966-1 6887091 6859769 5502636-1 5502636-2
6876338 23009257 23052609 23059687 J23059687
Drop-In Replacement, Zero Modifications
Replaces all Series II/III TD Amps (round or square) with no aircraft modification. Mix old and new PNs across a fleet - no need to replace all four TD amps at once.
Future Sustainability
Mitigates obsolescence risk on a part where the old-PN upgrade path is no longer economical, with continued support for parts and repairs.