If you have any doubt about the usefulness of CHT and EGT measurements on
each cylinder, check out Thomas Block's column in the May 2001 issue of
Flying.
Coolant temperature is definitely required (see section (b) (6) of the FAR
reproduced here in its entirety for day VFR ops):
Sec. 91.205 Powered civil aircraft with standard category U.S.
airworthiness certificates: Instrument and equipment requirements.
(a) General. Except as provided in paragraphs (c)(3) and (e) of this
section, no person may operate a powered civil aircraft with a standard
category U.S. airworthiness certificate in any operation described in
paragraphs (b) through (f) of this section unless that aircraft contains the
instruments and equipment specified in those paragraphs (or FAA-approved
equivalents) for that type of operation, and those instruments and items of
equipment are in operable condition.
(b) Visual-flight rules (day). For VFR flight during the day, the following
instruments and equipment are required:
(1) Airspeed indicator.
(2) Altimeter.
(3) Magnetic direction indicator.
(4) Tachometer for each engine.
(5) Oil pressure gauge for each engine using pressure system.
(6) Temperature gauge for each liquid-cooled engine.
(7) Oil temperature gauge for each air-cooled engine.
(8) Manifold pressure gauge for each altitude engine.
(9) Fuel gauge indicating the quantity of fuel in each tank.
(10) Landing gear position indicator, if the aircraft has a retractable
landing gear.
(11) For small civil airplanes certificated after March 11, 1996, in
accordance with part 23 of this chapter, an approved aviation red or
aviation white anticollision light system. In the event of failure of any
light of the anticollision light system, operation of the aircraft may
continue to a location where repairs or replacement can be made.
(12) If the aircraft is operated for hire over water and beyond power-off
gliding distance from shore, approved flotation gear readily available to
each occupant and at least one pyrotechnic signaling device. As used in this
section, "shore" means that area of the land adjacent to the water which is
above the high water mark and excludes land areas which are intermittently
under water.
(13) An approved safety belt with an approved metal-to-metal latching
device for each occupant 2 years of age or older.
(14) For small civil airplanes manufactured after July 18, 1978, an
approved shoulder harness for each front seat. The shoulder harness must be
designed to protect the occupant from serious head injury when the occupant
experiences the ultimate inertia forces specified in Sec. 23.561(b)(2) of
this chapter. Each shoulder harness installed at a flight crewmember station
must permit the crewmember, when seated and with the safety belt and
shoulder harness fastened, to perform all functions necessary for flight
operations. For purposes of this paragraph-- (i) The date of manufacture of
an airplane is the date the inspection acceptance records reflect that the
airplane is complete and meets the FAA- approved type design data; and (ii)
A front seat is a seat located at a flight crewmember station or any seat
located alongside such a seat.
(15) An emergency locator transmitter, if required by Sec. 91.207.
(16) For normal, utility, and acrobatic category airplanes with a seating
configuration, excluding pilot seats, of 9 or less, manufactured after
December 12, 1986, a shoulder harness for--
(i) Each front seat that meets the requirements of Sec. 23.785 (g) and (h)
of this chapter in effect on December 12, 1985;
(ii) Each additional seat that meets the requirements of Sec. 23.785(g) of
this chapter in effect on December 12, 1985.
(17) For rotorcraft manufactured after September 16, 1992, a shoulder
harness for each seat that meets the requirements of Sec. 27.2 or Sec. 29.2
of this chapter in effect on September 16, 1991.
For night VFR and for IFR there are of course additional requirements. FAR
91 (and other sections) are available at http://www.faa.gov/avr/AFS/FARS/far
-91.txt
While experimental category aircraft (US registry) do not have to meet all
of the requirements for certificated aircraft, the FARs do tell us what the
FAA believes is important for flight safety. Obviously these regulations do
not have the force of law outside of the US but they do provide appropriate
guidance for homebuilders regardless of location.
Best regards,
Rob Housman
A070
----- Original Message -----
From: Shaun Simpkins
Subject: What Engine Instruments do you need/use on a Rotax
914?
All:
I've been poring over the 914 Installation Manual to find out what needs and
what should be monitored in the cockpit.
The list I obtained is below. Could other 914 owners share what parameters
their setup monitors?
Red and Orange idiot lights
CHT ( looks like 1 sensor on the standard installation. Anyone do all
4?)
EGT ( looks like 1 sensor/side. Aren't 4 needed?)
Oil Temp
Oil Press
Manifold Pressure
RPM
Airbox Temperature
The following parameters have sensors that feed the TCU but don't display:
Ambient Pressure
Airbox Pressure
The following parameter is not sensed:
Coolant Temperature (why?)
The usual other engine systems parameters:
Fuel level, pressure, flow
Volts, Amps
OAT
Thanks,
Shaun Simpkins
A207
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