J. L. OSBORNE’s 4,024 pound Gross Weight Approval
1. Is that the only requirement needed for this GWI STC?
Yes and No:
Installed (or existing) Osborne tip tank kit.
Models 36 and A36 will not qualify … unless they have had a 300hp (up-grade) FAA approved installation and of course the Osborne tip tank kit.
Models A36 (with factory installed 300hp), A36TC and G36 (with Osborne tip tank kit installed) are eligible.
2. Are all 300hp (or greater) engine modifications that are FAA approved for the earlier 36/A36 qualify (permissible) for this GWI?
Yes, you are not stuck with any exclusive 300hp engine modification providing it is FAA approved.
3. How about any extra modifications required for this GWI (other than the tip tank kit and 300hp)?
No extras, the only modification needed is the Osborne tip tank kit and 300hp or greater. That’s it, no other engine or airframe modification are needed or required
4. What will this GWI STC approval do for my “36”?
Makes available the highest GWI STC and useful load on the market.
5.What are some of its features?
Gross weight is increased to 4,024 pounds.
This can be utilized with the least amount of restrictions.
6. What are the restrictions when I operate above my factory gross weight? (FGW)
This operation must be in “Normal Category” when above FGW or with fuel in the tip tanks.
7. Can I operate in Utility Category?
8. When can I operate in “Utility Category”?
Utility Category operations are permissible when the tip tanks are empty and airframe weight is at or below FGW pursuant to and in accordance with the factory’s AFM/POH requirements.
9. What are some of the other amenities this New STC provides?
Largest loading graph area (weight and balance envelope) GWI addition available. Highest forward & aft loading limits.
When above FGW, Normal Category operation will supplement the AFM/POH however
no main or tip tank fuel quantity levels are limited as approved in the AFM/POH.
Highest landing weight (4,024 lbs) can be with full tip tanks or any weight combination in the cabin/mains as per the AFM(s)/POH(s).
Being able to carry more cabin weight or fuel, equals useful load.
10. What is the estimated labor for this GWI STC?
Labor incurred for Osborne GWI STC has not been researched but is estimated to be about 1 hour. Note: this does not include Osborne tip tank kit installation labor.
11. In more detail, explain the available net weight gain?
The net useful load (GWI) Calculation below takes into consideration our tip tank kit weight:
Factory 3600 (FGW) Tip Tank Kit Net Increase
a. Selector Valve -19.20 lbs. 404.8 lbs.
b. Electric Transfer -27.3 lbs. 396.7 lbs.
Factory 3650 (FGW) Tip Tank Kit Net Increase
a. Selector Valve -19.20 lbs. 354.8 lbs.
b. Electric Transfer -27.3 lbs. 346.7 lbs.
12. The 300hp and Osborne tip tank kit STC requirement includes both tip tank kit modifications (Transfer and Selector Valve)?
Yes, both tip tank systems (Transfer/Selector) is approved, however the B36TC is not included.
13. Does this only apply for the tip tank kits manufactured by J. L. OSBORNE Inc.?
No, the same tip tank kit STC works regardless who manufactured it; J. L. OSBORNE Inc. or Osborne Tank & Supply.
14. What is needed to obtain Osborne’s new GWI STC?
When placing Order:
• Aircraft model, Serial Number & N number
• Tip Tank Serial Number
• 300 Horse Power Verification
The Following list of frequently asked questions (FAQ) is intended to be
a starting point for your technical questions and/or support needs.
Please read these questions carefully to see if they address any of the
information that you need.
- Why aluminum tip tanks ?
- How long have OSBORNE Tip Tanks been in
- What size Tip Tanks are available ?
- What Tip Tanks systems are available ?
- How fast does the tip tank fuel transfer to
its main tank ?
- Do I have to leave fuel in my tip tanks ?
- Do you ship International ?
- Do you drop ship orders ?
- Do you provide installation support ?
- Has OSBORNE ever supplied Beechcraft with
factory new Tip Tank kits?
- Does your tip tank kit include Nav &
Strobe lights ?
- How much does a tip tank kit weigh ?
- Do my ailerons have to be removed and
- Are your tip tank kits FAA approved ?
- Can you provide FAA 8130-3 form ?
- Do my tanks come pre-painted ?
- What is included in the tip tank kit ?
- Do I get a gross weight increase ?
- Who can install my tip tank kit ?
- Are your tip tank installations approved
with a 3 bladed propeller ?
- Does the tip tank kit include fuel gauge
- Is there a wing span change increase ?
- What aircraft records will my installers
need to complete the Tip Tank installation?
- Does J. L. OSBORNE, INC. carry Product
Liability Insurance ?
- Are your tip tanks made in the USA ?
OSBORNE (Brittain Industries) aluminum Tip Tanks have been in service
for over 50 years. Their lightweight
construction and longevity is unsurpassed. No grounding straps or
netting are required for electrical storm interference. Unlike other
inferior Tip Tank construction materials; lightning strikes uses
aluminum as a ladder, not a pass through like other materials.
Aluminum’s’ lightweight construction
is stronger and durable. Aluminum never warps or waves
Between Tip Tank attachment mounting screws. Final paint color shade
changes will not be an issue with aluminum material.
Ground strikes help minimize wing damage, not to mention the
durability and toughness of the aluminum tanks to resist fuel spillage
or impact rupture. System maintenance is virtually effortless.
OSBORNE (formerly Brittain Industries) aluminum tip tanks have been
in service for over 50 years. Still in service on Navion aircraft
that were manufactured in 1954. Piper Aircraft, Beechcraft Bonanza and
T34 models since 1960.
Bonanza and Navion are 20 US gallons each. Piper Comanche are
15 US gallons each.
Note: Fuel is all usable in both quantities Tip Tanks.
The following is contingent for certain aircraft models:
The original gravity feed is used via a manual selector valve, i.e.
direct engine feed.
The latest system for the Electric Transfer System: This is used via
a separate electrical toggle switch assembly pumping (transferring) tip
tank fuel to its corresponding (respective) main tank.
Tip Transfer time is approximately 50 minutes to 1 (one)
hour and automatically (shuts off pump) stops transferring when the Tip
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No. There are no requirements to keep the tanks filled avoiding fuel
cell dry- out or cracking etc.
Having no bladder or using inferior construction material
aluminum construction will not dry out.
Yes. Additional Handling charges may apply depending on
import/export documentation required.
Yes, we have technical stall available via our toll free number.
After our hours and non-business day our toll free number is forwarded
to a 24/7 answering service. Fax request and email.
Yes, Beechcraft used OSBORNE’s Tip Tank kit OEM (original equipment)
available when ordering factory direct.
OSBORNE still sells factory direct to Raytheon.
Yes our Tip Tank kits (Bonanza/Navion) include Whelen brand
navigation & strobe lights and are pre-installed in all approved kits,
however the power supply is not included.
Tip Tanks vary with aircraft type and model. However kit the ranges
are 19 lbs.–27 lbs.
No. Navion models are external aileron weights replaced by OSBORNE
Yes, OSBORNE holds the necessary Supplement Type Certificates “STC”
along with a FAA parts manufacturing approval (PMA).
Yes. This is only available upon request at time of ordering
and may warrant a documentation fee.
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No. We coat our tanks using a two part epoxy
primer/sealer. This epoxy coating is acceptable and compatible
for most topcoats.
Tip tank set, al necessary hardware, tubing, (pre-flared and formed)
cockpit fuel gauge, connectors, and selector valve/transfer pumps
Packing slip, Installation instructions, Installation drawings,
POH/FMS, Continued Airworthiness sheet STC etc. respectfully.
Yes, all models eligible, except certain single engine Piper Comanche
A qualified A & P (Airframe and Power plant) mechanic. Note: An IA (
Inspection Authorization) rating is required to release the aircraft
back into airworthiness service following approval of tip tank kit
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Yes. All kits (except PA 30 and 39 Comanche) are furnished with a 2
¼” round internally lit single gauge. A miniature selector toggle
(cross) switch is provided for LH & RH tip fuel quantity readings.
OSBORNE also offers a single 2 ¼” round internally lit single dual
(indicating) gauge upgrade, that shows both tip quantities (requiring no
No, it is negative, the Tip Tanks off set the factory wing tip faring
Current weight and balance, Airframe log book and Pilot Operating
Hand Book (POH/AFM)
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