All prices subject to change without notice
Many of the following kits have previously been offered for the Apache
model aircraft. All of the following are now fully STC'd for installation
on the PA23-250 series aircraft as well. Prices do not include
installation or freight charges.
Installation of this windshield results in lower cabin noise levels, dramatically enhanced
appearance and improved visibility. Cruise speed is increased by 3-5 miles per hour. This
windshield mounts approximately eight inches farther out on the nose than the original, and you
will need to obtain a 1 foot by approximately 7 foot piece of glareshield cloth to install in front of
and partially under your existing glareshield. We recommend a vertical card compass and the
electronic OAT instrument of your choice be installed at the same time. Call with questions, or if
your aircraft has a hot-plate installed. Windshields available in gray tint, green tint or clear.
New! Modern Throttle Quadrant Control Lever Kit
New! Vortex Generators
* Lower Lift Off Speed (Includes Horizontal Stabilizer Fairings)
* Lower Stall Speeds
* Improved Controllability
* Improved Characteristics
* Improved Safety
* S.T.O.L. Benefits
* Improved Aileron & Rudder Effectiveness
* Smooth Ride In Turbulence
* More Stable Instrument Platform
Adds stability and about 2-3 MPH to cruise. Enhances appearance and reduces VMC by
approximately seven MPH. You will notice that after initial rudder trim is set, it will require
almost no re-adjustment as fuel burns and weight shifts during flight. The fin is fiberglass,
and is about three times the size of OEM. The fin is large enough to consider the option of
installing hidden antennas and/or remounting an existing antenna inside.
Adds lateral stability at low speeds and improves aileron control. Cruise speed increased
by about 3-5 MPH. Enhances appearance and includes recessed navigation light mounts
with streamlined lenses. Reduces wingspan by about 32 inches over stock tips.
FLAP GAP SEALS
Increases climb performance & decreases stalling speed. Also shortens take-off roll and
improves overall handling characteristics. Cruise speed increased by 3-4 MPH.
'E' MODEL NOSE KIT
Another great enhancement to overall appearance, this modification adds about 14 inches to length
compared to stock nose. Reduces noise levels and extends baggage compartment space. Looks identical
to Aztec E & F nose. Includes streamlined landing-light lens and improved ventilation intake. This mod is
highly recommended when using any nose-mounted slaved compass and is a must for any radar
installation. We have noticed that slaved compass "swing" caused by electro-magnetic interference
(landing light turned on) is minimized after nose installation.
INSTRUMENT PANEL STC KIT
Approved for Aztec, Apache & Geronimo aircraft, this one-piece design eliminates cockpit display
clutter and is shock-mounted to isolate full panel. Several panel styles include back-lighting or
post-lighting, engine instrumentation and radio configuration options. Dual centerstack design
with option for copilot instruments. Kit price consists of STC paperwork, eight Lord mounts and
complete installation plans only.Swing-down buss/switch panel optional. Custom cut panels and
pre-fabricated PMA bracket sets available. This STC Kit affords the owner/installer great latitude in
customizing panel to fit individual avionics & instrumentation needs without the need for a field
approval. Installation available, call for details. We also offer a new fiberglass glareshield in two
styles for $389. Note: PMA approved, 2-1/4 inch round, dual backlit engine instrumentation/fuel
gauges available soon!
One piece aluminum glareshield in two styles made to fit panels listed above. Enhanced appearance,
visibility and practicality. Must be covered or padded with approved materials of owner's choice (not
included.) Call for details.
INFLATABLE DOOR SEAL
Models available with automatic (electric) or hand pump. Very noticeable difference in
noise levels with this unit installed. Call for current price & availability.
QUARTER-INCH SIDE WINDOW KIT
1/4" side windows replace OEM double-paned 1/8" windows. Popular kit includes frameless vent pilot
window, non-vented co-pilot window, both rear & right center windows and 3/16" (.187) emergency
exit window. Kit price is $995 for clear and $1,149 for tinted; MSLP. Add $125 and $150 respectively for
quarter inch-beveled emergency exit window. (This one is difficult to install and requires extreme
care & patience.)
LIGHTWEIGHT LOW-DENSITY SOUNDPROOFING / INSULATION KIT
Reduces noise level to a point of normal conversation. Improves passenger comfort and is an
effective barrier against heat transfer. Can be installed with or without the purchase of a new
MAJOR AIRFRAME INSPECTION and OVERHAUL
This inspection far surpasses a 1000 hour inspection and brings the airframe back to factory new
tolerances. Price will vary greatly with condition of airframe. Call for details.
Purchasing a combination of the above modifications will qualify you for a discount. Discounts
also available for AOPA members and FBO�s.
Rams-horn style control yokes. We currently have this STC but our supply has
back-ordered. A new manufacturer is in the process of designing an updated style yoke
similar to the Aztec F yoke. It will include push-to-talk switches on both yokes, provisions
for autopilot cut-off switches on both yokes, and electric trim switch-mounting provision on
pilot yoke. Price will be about $1,295 per pair.
Rochester engine instrumentation.We are currently working with Rochester Gauges of
Texas to introduce new 2-1/4" dual-needle STC'd backlit gauges. All gauges will be
electronic with analog movements. They will include: Fuel quantity with new sending units,
oil temp, oil pressure, fuel pressure, CHT & EGT. These gauges will eliminate the
inaccuracy and availability problems associated with the old AC and Stewart Warner
obsolete OEM units installed at the factory. These will be available for injected, carburated
and turbo-charged models. A 3-1/8" dual electric STC'd tachometer will also be available.
This unit will pick-up signals from the magnetos, thus eliminating the need for noisy, heavy
tach cables or expensive tach generators. Other advantages of these new gauges includes
reduced weight, modern appearance and no oil or fuel lines running into the cabin. All
gauges will be switchable for 14v or 28v operation.
Co-pilot brakes.We have been working with a firm in Wisconsin to add co-pilot brake
pedals and hydraulics similar to the OEM design found on some E and most F model
Aztecs. These will become available for all Aztec and Apache/Geronimo models in the near
Engine nacelles. We are in the process of designing an adaptation of our Geronimo engine
nacelles to fit the Aztec models. They will have the same 2-piece design as the Geronimo.
These nacelles incorporate a camlock system which allows a four minute removal and
re-installation time. The nacelles will include a re-designed induction air intake system and
will improve cooling, reduce shock-cooling and decrease drag. This improvement will also
increase combustion air inlet airflow.
All prices subject to change without notice.
The state of Montana has no sales tax.
Kit prices do not include crating or shipping charges.
All fully STC'd modifications include PMA-approved parts.
Speed figures established by exhaustive testing, and are relative to
particular airframes and other installed modifications. They are accurate
to within 2%.
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Montana Diamond Aire Inc.
Apache Modification Aircraft Corp.
1893 Airport Road
Kalispell, MT. 59901
John Talmage, CEO