EFFECTIVITY:
040-999
31-50-00Jan 10/90

PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

B. AnnunciatorPanel (continued)
CHART2 (Sheet 1 of 3)
ANNUNCIATOR PANEL FUNCTIONAL TEST

ANNUNCIATION  PROCEDURE
AnnunciatorPress-to-Test  Ensure electrical power is applied to annunciator control system. Activate press-to-testswitch and observe all annunciation. Place day/night dimming switch to night (dim) position and activate press-to-test switch. Annunciator lights must dim.
External Power Supply Apply 27.5 Vdc GPU. External power light must come on. Turn GPU off. Attached Annunciation Light must go out.
NOTE: When performing the following series of tests, use an auxiliary power unit to prevent drainingthe battery.
Annunciator Malfunction  Pull annunciator breaker (on essential circuit protection panel). Annunciator malfunctionlight must come on. Push breaker in and light must go out.
Starter Engage When starting engine, engage left or right starter and observe respective Annunciation starter engage light.
EngineFire Annunciation  Circuittest is achieved whenpress-to-testfunction is checked.
NOTE: Annunciation is part of fire extinguisher switch.
Engine Fire Extinguisher Disconnect wire E36M from left fire extinguisher (E36L for right fire extin-Inoperative Annunciation guisher). Ensure respective fire extinguisher light come on. Reconnect wire and ensure light goes out.
NOTE: Annunciation is part of fire extinguisher switch.
Chip Detector RemoveconnectorE116 for left chip detector (or connector E214for right Annunciation chip detector. Short pins A and B together and respective chip detect light must come on. Remove short and install connector; light must go out.
Oil Temperature  Remove connector E119 for left oil temperature test (or connector E217 for
Annunciation  right oil temperature test). Using a resistance decade box, select 130 ohms and place resistance in series with pins A and B of connector. Respective oil temperature light and master warning horn and light must come on. Lower resistance to approximately 126 ohms. Oil temperaturelight, master warninghorn and light must go out. Install connector.
Fuel Filter Annunciation  Disconnectwires Q11S-20 andQ11T-20for left fuel filter check (or Q22S-20 andQ22T-20for right fuel filter check) and jump two wires together. The
respective light must come on. Remove jumperand ensure light goes out. Reconnectwires to fuel filter.
EFFECTIVITY:
040-999

Jan10/9031-50-00

PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

B. AnnunciatorPanel (continued)
ANNUNCIATION
BleedAir Hot Annunciation
Battery Hot Annunciation
Baggage Door Annunciation Cabin Door Annunciation Fuel Heat Annunciation
IgnitionOnAnnunciation
EFFECTIVITY:
040-999
CHART2 (Sheet2 of 3) ANNUNCIATORPANELFUNCTIONALTEST
PROCEDURE

Ground the following wires to their respective ground jumper wires or
airframeground. (Referto 21-10-00, PA-42-720(AdvancedTrainer)Wiring
DiagramManual.for Bleed Air Control WiringDiagram).
Wire to temperature sensorswithinbleedair tubes are as follows:
LeftWingRoot Forward: E24R-20 Right Wing RootForward: E24H20
Wiresto temperature sensorsin bleed are shields are as follows:
Left Wing Root Forward: E24T-20 Right Wing Root Forward: E24F-
20

Wiresfrombleedair duct temperature sensorsbehindeachfirewallare as
follows:
Left Nacelle: E24S-20 RightNacelle:E24B-20
When each wire is grounded, the respective (left or right) Bleed Air Hot
warning light must come on, along with the master caution horn. After
disconnecting them from ground, the light must go out (also upon
reconnectionto the sensor/harness).
Disconnectwire P11C-20in battery compartment. Battery hot light and
masterwarninghornlight must comeon. Reconnectwire and light must go
out.

Open baggage door.Baggagedoorajar light and master warninghornand
lightmustcome on. Openbaggagedoor(to lock nose cone) andclose
noseconeand baggage door.Baggagedoorlightmust go out.
Opencabinand cargo door. Cabindoor light, masterwarninghornand light
mustcomeon. Close both doors; all warnings must go out.
Locateandactivate FUEL TEMPSENSEcircuitbreaker. On theaft, right sideof each engine, locate fuel temperature probesanddisconnecttheir respectiveplugs(ConnE114, left side: ConnE212,rightside). Place a resistancevalueof 90.5 to 90.8 ohmsbetweenpins A and B of each connector. In nose baggage area behindcloseout panels, locate fuel temperaturemonitorbox. On thebox,adjustappropriatechannel(channel1, left side; channel2, rightside) until FUELTEMPLOannunciatorforthesideaffected just comes on.
Whenstartingengine,placeleft (or right) ignition switchto ON position.Left (orright) Ignition Onlightmustcomeon. Move ignitionswitchinAUTO and lightmust remain on. Startengineand bring torqueabove400ft-lbs. The annunciatorlight must go out.
　
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