Lean Operating Mode - Electronics International UBG-16 Operating Instructions Manual

It is recommended that the EGT columns be normalized while operating your aircraft in normal cruise
flight, with the engine leaned. When operating in the Normalized Mode only
normalized on the UBG display by performing the following steps:
1. 1. 1. 1. 1. Push and hold the Mode Switch to the left until "PROGRAM" appears in the digital display. Release the
Mode Switch and the digital display will show "Normalize N".
2. 2. 2. 2. 2. Push the Step Switch right or left to change the "N" to a "Y" ("NO" to a "YES").
3. 3. 3. 3. 3. To exit this programming mode, push and hold the Mode Switch to the left until the word "END" ap-
pears in the digital display.
Note: The TIT column of bars will not be affected by normalizing the EGT columns. Note: Note: Note: Note:
Normalizing brings the EGT columns to the same height and stores the data in memory. Once the EGTs are
normalized, each time you operate your aircraft in normal cruise flight with your engine leaned, you may put the
UBG into its Normalized Operating Mode and look for abnormally high or low columns of bars. Many problems
occur slowly over time. The UBG's Normalized Operating Mode helps you spot these problems as they occur.

Lean Operating Mode:

Lean Operating Mode:
Lean Operating Mode: Lean Operating Mode: Lean Operating Mode:
This manual does not make any recommendations as to specific exhaust gas temperature(s) at which to lean your
engine. Check the airframe and/or engine manufacturer's recommendations to properly lean your engine. It is the
pilot's responsibility to lean the engine properly.
We recommend leaning your engine in cruise. A rich running engine wastes fuel and tends to run rough. Good
leaning techniques result in cleaner combustion chambers with fewer lead salt deposits on the pistons and exhaust
valves. Also, proper leaning means less spark plug fouling, longer life for the plugs, reduced maintenance costs
and a considerable fuel savings. Furthermore, proper leaning at cruise during cool or cold weather aids in
raising engine and oil temperatures to desirable minimums in order to evaporate the water and acids out of
the oil. Water and acids attack the insides of an engine, causing rust and corrosion.
When you enter the Lean Operating Mode of the UBG, the right portion of
the digital display will show the current EGT for the cylinder which peaked
first the last time you leaned your engine. The word "LEAN" will be
displayed in the left portion of the digital display. The UBG will not activate
the Lean Operating Mode until the hottest EGT has raised 10'F.
Most engines will exhibit a 200 to 350'F rise in EGTs before a cylinder
reaches peak. Start the leaning process by rough leaning your engine near
peak EGT (pull the mixture back to a predetermined setting or use a fuel
flow instrument). Experience should be your guide. Do not lean past
peak EGT during rough leaning.
Note: Note: It is not recommended to lean an engine for peak EGT above 75% power setting. It is not recommended to lean an engine for peak EGT above 75% power setting.
Note: Note: It is not recommended to lean an engine for peak EGT above 75% power setting. Note: It is not recommended to lean an engine for peak EGT above 75% power setting. It is not recommended to lean an engine for peak EGT above 75% power setting.
Normalized Mode only, the EGT bars may be Normalized Mode only Normalized Mode only Normalized Mode only
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