By Order of the Secretary of the Army: 
ERIC K. SHINSEKI 
General, United States Army 
Chief of Staff 
OFFICIAL: 

JOEL B. HUDSON

Administrative Assistant to the
Secretary of the Army

9917309

DISTRIBUTION:
To be distributed in accordance with Initial Distribution Number (IDN) 313811, requirements for TM 1-1520-253-10.

Personnel performing operations, procedures, and practices which are included or implied in this technical manual shall observe the following warnings. Disregard of these warnings and precautionary information can cause serious injury or loss of life.
BATTERY ELECTROLYTE
Battery electrolyte is harmful to the skin and clothing. If potassium hydroxide is spilled on clothing or other material, wash immediately with clean water. If spilled on personnel, immediately .ush the affected area with clean water. Continue washing until medical assistance arrives. Neutralize any spilled electrolyte by thoroughly .ushing contacted area with water.
CARBON MONOXIDE
When smoke, suspected carbon monoxide fumes, or symptoms of anoxia exist, the crew should immediately ventilate the cockpit.
ELECTROMAGNETIC INTERFERENCE (EMI)
No electrical/electronic devices of any sort, other than those described in this manual or appropriate airworthiness release and approved by USAATCOM AMSAT-R-ECU, are to be operated by crewmembers or passengers during operation of this helicopter.
FIRE EXTINGUISHER
Exposure to high concentrations of extinguishing agent or decomposition products should be avoided. The liquid should not be allowed to come into contact with the skin, as it may cause frost bite or low temperature burns.
HANDLING FUEL AND OIL
Turbine fuels and lubricating oils contain additives which are poisonous and readily absorbed through the skin. Do not allow them to remain on skin longer than necessary.
HIGH VOLTAGE
All ground handling personnel shall be informed of high voltage hazards when making external cargo hookups.
NOISE
Sound pressure levels in this helicopter during some operating conditions exceed the Surgeon General’s hearing conservation criteria, as de.ned in DA PAM 40-501. Hearing protection devices, such as the aviator helmet or ear plugs are required to be worn by all personnel in and around the helicopter during its operation. When .ights exceed 100 minutes during any 24 hour period or when speeds are above 120 knots, helmet and ear plugs shall be worn by all crewmembers.
ELECTROMAGNETIC RADIATION
Potential radiation hazard exists at the TACAN antenna when the TACAN is turned on. Make sure that no person is within three feet of the antenna when power is applied to the helicopter. The HF radio transmits high power electromagnetic radiation. Serious injury or death can occur if you touch the HF antenna while it is transmitting. Do not grasp, or lean against the antenna when power is applied to the helicopter.
ALQ-144
Do not continuously look at the ALQ-144 infrared countermeasure transmitter during operation, or for a period of over 1 minute from a distance of less than 3 feet. Skin exposure to countermeasure radiation for longer than 10 seconds at a distance less than 4 inches shall be avoided.
Change 4 a/(b Blank)

LIST OF EFFECTIVE PAGES
Insert latest change pages; dispose of superseded pages in accordance with applicable policies.
NOTE: On a changed page, the portion of the text affected by the latest change is indicated by a vertical line in the outer margin of the page. Changes to illustrations are indicated by a vertical line in the outer margin of the page next to the illustration title.
Dates of issue for original and change pages are:
Original  0  ......................  29 January 1999 
　
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