1. AVIATION 325 PITOT - STATIC SYSTEM VACCUM SYSTEM
ENGINE INSTRUMENTATION
ANNUNCIATOR SYSTEM

2. PPH = Pounds per Horsepower

3. Pitot-Static System
OVERVIEW

4. Pitot-Static System
Components
Pitot-Static Head

5. PITOT-STATIC HEAD (1)

6. PITOT-STATIC HEAD (2)

7. Pitot-Static System
Components
Drain

8. Pitot-Static System Components Alternate Static Source
Storm Window Closed
Cabin Vents Closed
Heater & Defroster On

9. Vacuum System

10. Vacuum System
Overview

11. Vacuum System
Dry Pump
Regulator

12. Vacuum System
Manifold Check Valve

13. Vacuum System
Filter
Low Vacuum Switch

14. Vacuum System
Vacuum Gauge

15. Engine Instruments

16. Engine Instruments Dual Tachometer Gauge Dual MAP Gauge Left magneto
Green Arc 500 to 2700 rpm
14 VDC
3 amp CB on main bus
Dual MAP Gauge
Intake Port #3 or #4

17. Engine Instruments Fuel Pressure Gauge
Fuel Pump Pressure - Carb Air Pressure
.5 PSI to 8 PSI
14 VDC
Engine group main bus

18. Engine Instruments Oil Pressure Gauge Oil Temperature Gauge 14 VDC
Engine group main bus
Oil Filter Housing
temp of oil entering engine
75F TO 245F
Oil Cooler (185F)
Oil Pressure Gauge
14 VDC
Engine group main bus
pressure switch in oil line at outlet of oil pump

19. Engine Instruments Exhaust Gas Temperature Gauge
Bimetallic temp probe
#1Cylinder Exhaust Manifold
Cylinder Head Temp Gauge
# 4 Cylinder
200F to 500F
14 VDC
Engine group main bus

20. ANNUNCIATOR SYSTEM

21. Annunciator System Introduction Components Lights
Fault Warning Flasher
Seminole Annunciator Lights

22. INTRODUCTION
Warning and caution indicators may be the first indication of trouble or malfunction in some system or component of the airplane

23. Annunciator System Components
Annunciator Panel
Press-to-Test Switch
Fault Warning Flasher

24. Annunciator Lights Red Warning - Immediate Attention and Action
Yellow (or Amber) Caution - Attention but not Immediate Reaction
Green Advisory
White - System Status

25. Fault Warning Flasher If Fault Requires Immediate Attention
Appropriate Red Warning Annunciator on Panel Illuminates

26. Flasher begins Flashing
Press to Reset
Red Annunciator remains on until fault is corrected or condition no longer exists

27. Fault Warning System
Green or Yellow Annunciator Light will not trigger the fault warning system
Some Systems include aural warnings

28. Seminole Annunciator System

29. Annunciator Lights Press-to-Test ALT - Amber Alternator Off Line
ALT Switch Turned Off
Over Voltage Relay

30. Annunciator Lights
VAC -Amber
Vacuum Less Than 4.25” Hg

31. Annunciator Lights
OIL - Amber
Oil Pressure Less Than 15 PSI

32. Annunciator Lights LOW BUS - Red
Voltage of Alternators Less Than 12.5 V

33. Annunciator Lights HEATER OVERHEAT - Red
Heater Temperature Exceeds 300 to 400o F
Safety Switch

34. end