TGH Aviation offers aircraft component repair on the following Lockheed Models. Below is a list of the most commonly requested repairs and does not eliminate capabilities on other instruments used in this make of aircraft. If you need an instrument repaired that is not listed below, please call our Sales Department at 1 (800) 843-4976.
Veteran and Technician Brian Brown started with TGH Aviation in 2005. For the past fourteen years he has been the Repair Lead Tech working on Remote Vertical and Directional Gyros. Brian holds an Degree in Electronics and Served in the Airforce as an Airframe Powerplant Crew Chief.
TGH Aviation and its employees enjoy Brian’s sardonic humor and superior overhauls and repairs. His work carries quality and precision.
“Life isn’t about our routines; it’s about finding the hidden treasures of splendor in the tiny moments we have”
Corrie Vallance
When Brian is not at TGH, he enjoys spending time with his wonderfully large family. With seven children, a beautiful wife, many grandchildren and even a few great grandchildren, he stays busy and happy. His personal hobbies include reading and camping when he’s not taking care of his family.
You can be confident in TGH Aviation to be a trusted source for all your Flight Support Systems overhauls and repairs. We employ extraordinary people with great minds and infallible skills. Our dependability is the product of our exceptional team and the mission of TGH Aviation’s FAA Repair Shop.
TGH Aviation offers aircraft component repair on the following Convair Models. Below is a list of the most commonly requested repairs and does not eliminate capabilities on other instruments used in this make of aircraft. If you need an instrument repaired that is not listed below, please call our Sales Department at 1 (800) 843-4976.
TGH Aviation offers aircraft component repair on the following Beechcraft Models. Below is a list of the most commonly requested repairs and does not eliminate capabilities on other instruments used in this make of aircraft. If you need an instrument repaired that is not listed below, please call our Sales Department at 1 (800) 843-4976.
| AIRCRAFT | P/N | MFG | NOMENCLATURE |
| BEECHCRAFT KING AIR 200 | 4000B-10 | EDO | DG |
| BEECHCRAFT KING AIR 350 | 1U367-207-8 | SIGMA TEK | GYROSCOPE |
| BEECHCRAFT KING AIR 350 | 1U367-232-2 | SIGMA TEK | GYROSCOPE |
| BEECHCRAFT KING AIR 90 | 200-5 | AIM | DIRECTIONAL GYRO |
| BEECHCRAFT KING AIR 90 | 90-380009-7 | GULL | FUEL FLOW TRANSMITTER |
| BEECHCRAFT KING AIR 90 | 5000B-10 | EDO | GYROSCOPE |
TGH Aviation offers aircraft component repair on the following Bell Helicopter Models. Below is a list of the most commonly requested and does not eliminate capabilities on other instruments used in this make of aircraft. If you have an instrument not listed below, please call our Sales Department at 1 (800) 843-4976.
TGH Aviation Celebrates 60 Year Anniversary
Auburn, CA, March 30th, 2017
TGH Aviation, one of the most trusted and respected Part 145 Repair Stations in the industry, this year celebrates its 60th anniversary. TGH Aviation takes pride in its humble beginnings and appreciates the loyalty and dedication of both customers and employees throughout the past six decades. The company will commemorate the occasion with a number of customer appreciation specials and anniversary promotions throughout the year.
In 1957 founder Emery “Claude” Oxley Senior set out with a vision to specialize in the repair of gyroscopes for General Aviation aircraft. Claude originally began working out of his home in Riverside, California before his son Emery moved the business to a small wooden building in Auburn, California and joined forces with Chief Engineer, Rich Anderson. The early years were critical to the long term success of The Gyro House, now known as TGH Aviation. The founders built a strong infrastructure for the future by developing the TGH Aviation reputation as a top quality aircraft instrument repair facility with superior customer service.
Over the course of the last 60 years, TGH Aviation has vastly expanded its capabilities beyond gyroscopes, evolving into a diverse aircraft instrument repair facility that has become known world-wide. TGH Aviation now offers over 20,000 service capabilities, including the repair of primary flight instruments, avionics, aural warning systems, fuel flow transmitters, and their related indicators and refueling sensors. Today TGH Aviation is a valued supplier to the United States Department of Defense, NATO and a world-wide network of aviation maintenance facilities and parts brokers while still maintaining its legacy customer base of General Aviation pilots.
TGH Aviation provides outright sales, exchange sales, avionic installations and upgrades, repair services, and holds distributorships for most of the major manufacturers of the aforementioned product lines. The company’s repair shop customer base spans all areas of the industry from general aviation, corporate aviation and commercial aviation. The customer base includes airlines, parts brokers and maintenance facilities on five continents.
The past 60 years have been a hugely successful time for TGH Aviation, which now consists of a fully operational repair station, fuel lab, online pilot supply store and an avionics hangar. A veteran-owned company, TGH Aviation employs forward-thinking, growth-oriented management and all employees work to build the company reputation while improving industry presence and stature. The company is delighted to have become a part of the local community and to have had the pleasure of working with and meeting many people over the years and look forward to continuing to build on these strong relationships in the future.
As TGH Aviation looks to the next 60 years the mission continues to be to provide customers with high quality products, overhauls and repairs, all delivered with premiere customer service. As one of the most trusted and respected Part 145 Repair Stations in the industry today, TGH Aviation strives to create a great customer experience each and every time.
For a complete list of capabilities, go to www.tghaviation.com for more information.
Airspeeds – Selecting a Replacement Indicator
Typically, you can replace any airspeed indicator with another manufacturer’s indicator of the same type and range. However, there are some considerations, which should be taken into account.
Aerosonic and Kollsman indicators often have a longer case than other manufacturers, this could cause an installation problem in some aircraft.
On typical indicators the Pitot input will be in the center of the back of the indicator, with the Static input to the right, when viewed from the rear. Occasionally you will find some older indicators where this was reversed. This may cause installation difficulties on some aircraft.
TGH Aviation offers custom range markings for all blank-dial instruments (most commonly, factory new units) and re-screening services on used instruments in need of refreshed or adjusted range markings. Call or email one of our sales rep’s today for assistance and quotes on all of your Airspeed or other instrument requirements.
Airspeeds – Frequently Asked Questions
What would cause my airspeed indicator to be stuck at zero all the time?
A common cause of this is a problem with the Pitot source. If the line from the Pitot tube has disconnected, then pressure will not be applied to the instrument.
If the Pitot tube is clogged, then pressure will not be applied to the instrument.
It is common for Leaf Bugs to build nests in Pitot tubes and effectively clog them.
What would cause my indicator to be stuck at a high speed all the time?
A common cause of this is over pressure being applied to the Pitot tube. Aircraft are often washed using a high-pressure water hose. A careless mechanic may spray the hose across the Pitot tube applying high pressure to the air speed indicator. This will usually destroy the diaphragm. Units damaged in this way normally cannot be repaired and must be replaced.
Can you re-screen and/or range mark my dial?
Yes, we can. The repair department will advise you of the fee for this process. Screening dials is not done in house, this function is done at an outside vendor. The repair shop will advise the lead time. In order to ensure that the proper range marks are applied we require a copy of the airspeed specifications that are in the Pilot’s Operating Handbook.
The temperature bulb on my true airspeed indicator is broken can you fix it
No, we cannot. The bulb on a true air speed indicator is filled with gas. All of the gas escaped when the bulb broke. The bulb must be replaced. However, these bulbs are extremely expensive and extremely difficult to find.
Is the indicator you are selling me, Tso’d ?
United Instruments, Edo-Aire, Kollsman, Garwin, Aerosonic – Yes
UMA – No
If an instrument is certified to a TSO, it must state such on the ID plate. If it does not state the TSO on the name plate then you must assume that it is not approved to the TSO.
What is a TSO ?
TSO stands for Technical Standard Order. This is an FAA document, which, defines how a specific type of instrument should work in order to be considered airworthy.
What is the tolerance (accuracy) on an airspeed indicator?
Typically +/-2 (Knots or Miles per hour) up to 200 after which it is typically +/-3.
Why does it cost so much to overhaul my airspeed indicator?
Overhauling an airspeed indicator is not as simple as you would think. A typical overhaul includes all of the following steps:
Total dis-assembly and inspection.
Determine and correct the cause of failure.
Ultrasonic cleaning of all jewels, pivots, and gears.
Reassemble internal components.
Silk-screen dial and/or range mark
Calibrate the unit to manufacturers and/or FAA specifications
Assemble unit into case.
Seal Case.
Verify calibration of final assembly.
Accomplish cosmetic touch-up.
Complete all FAA mandated paperwork and certifications.
The typical time required to overhaul an airspeed indicator can range from 1 hour for a simple unit to over 3 hours for complex units.
Calibration of an airspeed indicator is a complex process. Airspeed is a non-linear function, which must be displayed on a linear dial. There are at minimum seven calibration points that are all interactive with each other.
Airspeeds – Get to Know the Operation and Manufactures
How it works
Pitot pressure is forced into the diaphragm causing it to expand like a balloon. Static pressure is contained within the indicator case and surrounding the diaphragm. As the static pressure changes it, will either cause the diaphragm to compress, as the aircraft loses altitude or allow it to expand as the aircraft gains altitude. This expansion and contraction of the diaphragm is mechanically linked to the pointer causing it to move around the dial thereby displaying the speed of the aircraft as a function of the difference between the Pitot and static pressures.
Range Marks
Range marks are a reminder to the pilot of the aircrafts basic operating envelope as it pertains to airspeed. Typical range marks found on an air speed dial are:
White Arc – VFE – This is the maximum speed at which the aircraft can operate safely with the flaps extended.
Green Arc – This is the normal operating range
Yellow (Orange) Arc – Caution
Red Radial – VNE – Never exceed speed
Blue Radial – This is the minimum operating speed using one engine on a two engine aircraft.
Note: Maneuvering speed is not marked on the dial, it is normally on a placard, which is located on the instrument panel.
Manufactures
The following companies all have manufactured air speed indicators and are the most common that you will see:
United Instruments
Kollsman
Aerosonic
Aeromarine
McCleod
UMA
Garwin
Edo-Aire
Airspeeds- Basic Principle of Operation
Main Components
The major components of an air speed indicator are:
Case
A standard air speed indicator for general aviation comes in a 31/8 inch diameter case. This is a standard size for most general aviation indicators. It is important that an air speed case be air tight as the case contains the static pressure input.
A leaky air speed case will cause the indicator to give erroneous readings. There are two input ports on the back of the case. These ports are the Pitot port and the Static port. These ports are connected to aircraft Pitot tube and Static port respectively.
Diaphragm
A diaphragm is essentially a balloon made of very thin metal. Typical metals used for this purpose are copper or brass. The diaphragm is sealed at all points except for one very thin pressure input tube. This tube is located directly in the center of the back face of the diaphragm. The pressure tube is connected directly to the Pitot port. The thickness of the metal used in manufacturing the diaphragm will determine the range of the air speed indicator (thin = low speed, thick = high speed). It is important to note that this diaphragm is extremely delicate. Picking up a unit a blowing air into the input port will damage the diaphragm.
Dial
The dial will contain the speed information and any pertinent range marks.
Pointer
The pointer points to the current speed of the aircraft as indicated on the dial.
Mechanical Linkage
The mechanical linkage connects the pointer to the diaphragm.
Hair Spring
The hair spring returns the pointer to zero when pressure is removed from the indicator.
Jewels and Pivots
The pivot is the spindle or axle for the pointer. Jewels are glass bearings on which the pivot rotates.
