Last updated: 3 June, 2008 16:46 by Bryan Weatherup
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CHIP Light - A magnetic chip detector is located at the bottom of the RGB to provide the pilot with a warning signal for metal particles in the oil and possible engine failure. The chip detector is a dual-element probe with one probe magnetized and connected to a dc potential and a second element comprised of an insulated wire to the fault circuit. The detector is exposed to the oil flow, and functions as a normally open switch. If a large metal chip or mass of small metal particles bridges the detector gap, a circuit is completed, illuminating the flashing MASTER CAUTION light and a yellow CHIP light on the annunciator panel.

Chip Detector Caution Light On Ground

Chip Detector Caution Light In Flight

  1. PEL - EXECUTE (850 ft/lb max & avoid unnecessary PCL movements)

    If engine failure/mechanical malfunction occurs:

WARNING - Torque indications may be erroneous because of reduction gearbox failure. Careful attention should be given to rate of descent, and to rate of climb, setting PCL as required to maintain proper PEL profile.

NOTE - For comparison purposes only, an 850 ft-lb climb on a standard day should yield an approximate minimum rate of climb of 1,200 fpm (clean), 700 fpm (gear down). If indicated climb rates are significantly lower, suspect erroneous torque indications and increase power cautiously to achieve proper airspeed/VSI combination. Closely monitor engine instruments for secondary indications of rising ITT, high oil temperature, and/or fluctuating oil pressure. If secondary indications of engine failure occur while on or above ELP profile, consideration shall be given to securing the engine.

NOTE - Illumination of the magnetic CHIP detector light indicated that metal particles are present in the propeller reduction gearbox.

Generator Failure

  1. Starter Switch ..................................... OFF (Both cockpits)
  2. Generator Switch ................................ ON (Reset)
    If annunciator remains illuminated:
  3. Electrical Control ................................. TAKE COMMAND
  4. Generator Switch ................................. ON (Reset)
    If generator does not return to line:
  5. Electrical Load...................................... Reduce
  6. Land As Soon As Practical

- Complete loss of electrical power: Instrument flight NOT possible.
- Operating on battery power <20 min.

Inverter #1 or #2 Failure
If inverter annunciator and master caution illuminate:

  1. Other Inverter ............................................ SELECT
    If annunciator remains illuminated:
  2. Electrical Control ....................................... TAKE COMMAND
  3. 115-VAC, 1A Circuit Breaker.................... IN
  4. Inverter control relay circuit breaker ........... IN

Inverter #1 selected
Front Cockpit
INVERTER Annunciator Light
Loss of Attitude Gyro and Turn Needle
Rear Cockpit
INVERTER Annunciator Light
Loss of Attitude Gyro
Inverter #2 selected
Front Cockpit
No indications
No indications
No indications
Rear Cockpit
Loss of Attitude Gyro and Turn Needle

Primary governor failure

Normally, the primary and overspeed governor and fuel topping function will act in sequence to hold propeller rpm within suitable range to continue flight or to reach a suitable repair facility. If the propeller is being governed by the fuel topping governor alone, expect moderate surges in propeller rpm, N1, torque and fuel flow as fuel topping activates and deactivates.

Propeller Speed Above 2200-2332 RPM / 2332+ RPM
1. Attempt to adjust rpm to normal operating range by manipulation of the Condition Lever.
If normal indication is restored
2. CONTINUE FLIGHT / Land ASAP using NORMAL procedures (if 2332+ RPM)
If adjustment of the Condition Lever fails to produce normal propeller response
3. Land ASAP using PEL procedures.

CAUTION - Advancing the EPL beyond the point at which the fluctuations are minimized will aggravate the overspeed condition.

NOTE - If activation of the primary fuel topping governor has occurred, Py air will be bled automatically and fuel flow will be reduced towards minimum, causing corresponding fluctuations in N1, torque, fuel flow, and prop rpm as rpm surges to 2398 and is then reduced again by the fuel topping function. Engaging the EPL will lessen the severity of low-end fluctuations.

Uncommanded Propeller Feathers

  1. Condition lever - FULL INCREASE RPM
    If propeller remains feathered:
  2. PCL - ADVANCE (as required)
    If the resultant power does not improve performance:
  3. PCL - IDLE
  4. Execute ENGINE FAILURE procedures.

NOTE - In the event of a primary governor shaft failure, the propeller will move toward feather; however, unboosted engine oil pressure alone may be sufficient to maintain propeller pitch between feather and normal governing rpm range at high-power settings. Resultant power may be sufficient to maintain level flight.

NOTE - Because it is feasible for the propeller to unfeather and restore useful power, consideration should be given to leaving the condition lever at FULL INCREASE RPM until intercepting the emergency landing pattern (ELP).

NOTE - Generator power will not be available after engine shutdown.

Propeller RPM fluctuations
Propeller rpm fluctuations caused by fluctuating blade angle will be accompanied by a corresponding torque flux and will be audible. Propeller rpm fluctuations may be caused by a faulty propeller overspeed governor test circuit or a malfunctioning primary governor. A malfunctioning primary governor may be caused by metal particles in the oil system and may therefore be the precursor to a chip light.

  1. PROP TEST circuit breaker - PULL
    If fluctuations cease, continue flight. If fluctuations continue:
  2. Land ASAP using PEL procedures.

New Maneuvers for this event:

Approach Turn Stall (ATS):

  1. Configuration: 90 kts, Dirty, Landing Lights ON, (6500’ AGL)
    (Use level speed change into downwind configuration w/landing checklist)
  2. Checklist: BCHAIR
  3. Clearing turns: 30° AOB, 180 deg.
  4. Power 300 ft-lb; TRIM L/U for 90 KIAS descent
  5. 30° AOB
  6. Power 200 ft-lb and put lower stack on horizon (12-15°)
  7. RELAX backstick, MAX power, ROLL wings level
  8. Climb at 90 KIAS to the next 500’ interval
  9. Level off, trim for 90 KIAS steady-level flight
  10. Power 600 ft-lb TRIM L/U
  11. Normal Cruise, Landing Lights OFF, Auto Ignition Switch OFF

Radio Calls:

3: “Navy Corpus Ground, Ranger ___, taxi from ____B/C/G line with information _____ATIS
3: “Navy Corpus Ground, Ranger ___, further taxi”
4: “Navy Corpus Tower, Ranger ___, takeoff”
4: “Ranger ___, cleared for takeoff / hold short [13L/13R/17/31L/31R/35]”

“Time is ______, Transponder Altitude, Pitot heat off, strobe lights on, T/O checklist complete”
ICS: “Engine and flight instruments checked...
         Torque 500 ft-lbs, ITT ____, Prop 2200 RPM, Fuel Flow 335, N1 _____%,
         Oil Temp & Pressure in the green, Fuel ___ left, ____ right, RMI aligned.
ICS: “Fuel caps secure, 1-2-3 up and locked”
8:  “Corpus Departure, Ranger ___, Off Navy Corpus, working [north/south] [high/low]”
ICS: Engine instruments normal, fuel is _____ left and _______ right, and our position is _______”

Working High
8:  “Corpus Departure, Ranger ___ [Bob Hall Pier, Mustang Beach, Portland] terminate”
...           “Ranger ___”
17: “Corpus Approach, Ranger ___, (position), what’s available [north/south] high”
...           “Ranger ___ claims ____”
: Engine instruments normal, fuel is _____ left and _______ right, and our position is _______”
17: “Corpus Approach, Ranger ___ leaving area ______"

Working Low
17: “Corpus Approach, Ranger ___, _____ situation, _______ position, _____ intentions
       ex: “Corpus Approach, Ranger ___, course rules to Waldron"

Bouncing at Waldron / A-Cty
8: “Corpus Approach, Ranger ___: “Corpus approach, Ranger ___, [Shrimp Ponds / Nine-Mile], terminate.”
15: “[Waldron Tower / RDO], Ranger ____, [Shrimp Ponds / Nine-Mile] inbound, touch-n-go's"

Returning home
8: “Corpus Approach, Ranger ___, (position), (alt), (intentions) with information ___”
8: “Corpus approach, Ranger ___, [Pt. Shamrock/Pt. Lima], terminate.”
4: “Navy Corpus Tower, Ranger ___, [Pt. Shamrock/Pt. Lima], [full stop/ touch and go]”
4: “Navy Corpus Tower, Ranger ___, initial for [13L/13R/17/31L/31R/35]”
4: “Navy Corpus Tower, Ranger ___, numbers for the break”
4: “Navy Corpus Tower, Ranger ___, 180, three down and locked, [full stop/touch and go]”
ICS: “Gear down, paddles checked”
4: “Navy Corpus Tower, Ranger ___, waveoff” (if necessary)
3: “Navy Corpus ground, Ranger ___, (position), taxi to my line”

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