PT6A-60A King Air B300/B300C Engine-Control Rigging
Explore the named components, make a prediction, then connect the supplied result to the system. This workshop adds coached practice alongside the course handbook and assessed lab.
Follow King Air deadband from linkage to response
Explore how the standard B300/B300C PT6A-60A linkage establishes deadband position, width and running pickup at the fuel control unit (FCU). The B300/B300C rigging task labels gas-generator speed N1. During its prescribed aft sweep from MARK 2 toward MARK 1, N1 remains steady while propeller RPM increases. A boundary mark and a dynamic response are different evidence.
B300/B300C power-linkage branches and proof dependencies — select a component
Green outlines identify components named in the selected exercise record; they do not indicate a healthy component.
Named connections and what each arrow means
- Power cable and cambox → Interconnect rod and serrated washerPhysical relationship: Cambox arm and interconnect linkage
- Interconnect rod and serrated washer → FCU schedule and idle adjustmentsPhysical relationship: FCU power-arm demand
- Interconnect rod and serrated washer → FCU deadband stop screwTask sequence: Establish position before judging width
- FCU deadband stop screw → Fuel flow, N1 and propeller RPMTask sequence: Repeat both boundaries and running proof
- Power cable and cambox → Reversing cable and beta mechanismPhysical relationship: Separate reversing-cable command
- Reversing cable and beta mechanism → Fuel flow, N1 and propeller RPMPhysical relationship: Beta mechanism influences pitch and RPM
- FCU schedule and idle adjustments → Fuel flow, N1 and propeller RPMInformation / signal: Fuel scheduling precedes gas-generator response
Power cable and cambox
Transmit the cockpit command from a defined dry-rigging baseline.
How it works with the rest
The control-rigging task establishes pedestal and cambox references, correct cable engagement, input-lever geometry and interconnect arrangement. Pins are removed before movement. Deadband setup uses the specified disconnected rear reversing clevis; no blocked motion is forced.
What the evidence must show
Establish the dry references and permitted free movement before a running adjustment.
Selected: Power cable and cambox
Follow the change through the system.
Fictional record KA60-1: a standard B300/B300C PT6A-60A has passed the specified dry baseline. In the task’s disconnected-rear-clevis setup, both paper boundaries are displaced aft while their separation is satisfactory. The supplied action follows the interconnect-rod-first position branch and then records both boundaries again. It supplies no real-aircraft turn count.
Before the recorded change
Dry baseline: pass. Both paper boundaries: aft of their named references. Boundary separation: satisfactory.
Next observation
Choose your prediction before revealing the supplied result.
Reference: B300/B300C MM 76-10-03 pp.501–502, Nov 1/2024; 76-10-15 pp.601–602, Task 76-10-15-7100, Nov 1/2024.
Course applicability and study references
Standard King Air B300/B300C PT6A-60A configuration within the course scope. Original concept diagrams and fictional supplied work records support formative learning. Diagram positions are not installation geometry; results are supplied rather than calculated from turns or clicks. Match installed propeller/modification effectivity and current applicable instructions for physical work.
- Standard control architecture and dry baseline
Supplied B300/B300C Maintenance Manual: 76-00-00 p.1, Apr 1/2018; 76-10-03 pp.501–502 and Figure 501, Nov 1/2024. Pedestal/cambox references, linkage and separate position/width tasks. Applicable installed propeller/modification branches remain separate.
- Dynamic deadband and adjustment dependencies
B300/B300C 76-10-15, Task 76-10-15-7100, pp.601–603, Nov 1/2024. Ordered ground-run checks, N1/propeller behavior inside the band, Wf-before-N1 response beyond each boundary and low-idle effects on maximum forward/reverse N1.
- Course model relationship
Accepted PT6A60-100 guided and integrated model treats position, width, idle, beta and restoration as separate proof requirements. This additional formative lesson neither changes that lab nor awards its completion. Supplied records do not turn normalized model inputs into real screw turns.
Original learning diagrams and supplied training records explain the stated relationships. Current aircraft-effective instructions and authorization govern actual maintenance.