40 ILCS 5/5-178
A board of 8 members shall constitute a board of trustees authorized to administer the provisions of this Article. The board shall be known as the Retirement Board of the Policemen's Annuity and Benefit Fund of the city.
The board shall consist of 4 persons appointed by the mayor of the city; 3 policemen employed by the city, at least one of whom shall be a lieutenant or of a rank superior to lieutenant, one of whom shall be of the rank of sergeant, and one of whom shall be of the rank of investigator or a rank inferior to that rank; and one annuitant of the fund, or a pensioner of any prior police pension fund in operation, by authority of law, in the city. Children less than age 18 shall not be eligible for board membership. The term of office for all members shall be 3 years. For the election to be held in 2008 only, the terms for the member who is a lieutenant or of a rank superior to lieutenant and the member who is a sergeant shall be 3 years and the terms for the member who is an investigator or a rank inferior to that rank and the annuitant member shall be 4 years. After the terms of the 2008 election are completed, the terms revert to 3-year terms for each elected trustee. Upon his election, the member holding the rank of investigator or a rank inferior to that rank shall be detailed by the Police Superintendent to the office of the board for the duration of his term as trustee.
The members of a retirement board holding office in a city at the time this Article becomes effective, including elected, appointed and ex-officio members, shall continue in office until the expiration of their respective terms or appointment and until their respective successors are elected or appointed, and qualified.
At least 30 days prior to the expiration of the term of office of each appointive member the mayor shall appoint a successor for a term of 3 years.
The board shall conduct a regular election at least 30 days prior to the expiration of the terms of the active policemen members and annuitant or beneficiary members for election of a successor of each such member for a term of 3 years.
Any member of the board so appointed or elected shall continue in office until his successor is selected and has qualified.
Any person so appointed or elected shall qualify by taking an oath of office. A copy thereof shall be kept in the office of the city clerk of the city.
40 ILCS 5/5-178