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4-27-50 M.B. Woodworth
[[underlined]] Procedure to Clear Up Fouled Spark Plugs- R-2000 Engines [[/underlined]]

It is permissible for the pilot to operate the DC-4 engines above normal run-up power if this is necessary to clear up roughness due to fouled spark plugs. The maximum limitations for this “burning out” so as to prevent excessive temperatures and pressures. Exceeding the specified limitations will result in engine damage due to excessive BMEP, and from the effect of excessive heat on the various seals, packings, etc., which may show up at a later date. The pilot should make every effort to check other possible causes of engine roughness (such as too cold a mixture; see Note 4 below) and determine definitely that the trouble is due to fouled plugs. Consideration must be given to cooling of the engine and its exhaust system after “burning out” to prevent rapid contraction of the stacks and the building up of residual heat after throttling the engine down. Shutting the engine off before it has cooled to its normal operating temperatures can result in damage similar to that caused by exceeding the maximum limitations during during the “burning out period.

MAXIMUM PERMISSIBLE LIMITATIONS - R-2000
[[6 COLUMN TABLE]]
MIXTURE|MAX. CYL. HEAD TEMP.|FIELD ELEVATION (FT.)|RPM|MP|TIME LIMITATION|AUTO|232^o C|0-3000|2100|38.0|   |RICH|(450^o F)|3000-5000|2100|37.0| 15 seconds|   |   |5000-6000|2200|35.0| (max.) [[/6 column table]]

NOTES: 1. When the cyl. head temperature is approaching the 232^oC maximum limit, keep in mind that the gauge indication is lagging behind the actual cylinder temperature somewhat and, therefore, the cylinders will be at or exceeding 232^oC before the gauge indicates that temperature.
2. Note that "burning out" is to be conducted only in AUTO RICH mixture and LOW blower.
3. Operating the engine longer than 15 seconds under "burning out" condition with no improvement in the previous rough condition, will adversely affect t [[the]] engine as a whole and the fouled plugs should be changed without further delay.
4. In cold weather, some carburetor heat may be beneficial to clear up engine roughness due to a cold mixture giving the same indication as fouled plugs.

5-1-50 M.B. Woodworth
[[underlined]] Engine Run-Up - DC-4 Equipment [[/underlined]]
Every effort should be made to run up this type airplane into the wind. Extensive damage can be caused by running up in a cross wind or a quartering wind. Recently, due to a torching engine, considerable damage was done to the deicer boot and the skin was actually buckled by the heat from an outboard engine. The airplane was evidently run up cross wind and heat and flame were blown against the blocking edge of the wing instead of straight back and under it. In cases where the run-up has to be made in a cross or quartering wind, be careful to maintain at least 900 RPM on the idling engine. This should keep it clear.

5-1-50 G.R. Janas
[[underlined]] Glide Slope Receivers [[/underlined]]
Relative to my memorandum of April 4, 1950, on the above subject, please be advised that all Collins VOR Glide Slope Receivers have been modified to eliminate the dampening created by the nose antenna.

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