OPINION OF THE COURT
The Teamsters Industrial Employees Welfare Fund, the Teamsters Industrial Employees Pension Fund, and the Trustees of the Teamsters Industrial Employees Welfare Fund and Teamsters Industrial Employees Pension Fund (collectively “the Funds”) filed suit against Rolls-Royce Motor Cars, Inc. (“Rolls-Royce”) seeking to collect delinquent welfare and pension fund contributions for Rolls-Royce’s probationary employees. The principal question on appeal is whether the collective bargaining agreement provision requiring Rolls-Royce to contribute to the Funds on behalf of each employee mandates payments for new employees during their sixty-day trial period. We hold that the provision’s scope of coverage is ambiguous. After considering the bargaining history and past practice of the parties in addition to the contractual
I. FACTUAL AND PROCEDURAL HISTORY
The underlying facts are undisputed. On April 4, 1984, Rolls-Royce and International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America, AFL-CIO, Local Union # 560 (“Local 560” or “Union”) signed a collective bargaining agreement. Rolls-Royce and the Union subsequently negotiated and signed new collective bargaining agreements approximately every two years, but all provisions relevant to this case contained identical language from 1984 to the present.
Article II(2)(b) of the collective bargaining agreement provides that new employees may be disciplined or discharged with or without cause for a trial period of sixty days. New employees must become members of Local 560 by the sixty-first day of their employment at which time they are “deemed to be regular employees covered by this Agreement.” App. at 31-32. Article II(2)(b) further states that trial period employees will “sometimes [be] referred to as ‘probationary employees’.” App. at 31.
Article XX(a) states that Rolls-Royce will contribute to the Funds on behalf of “each employee.” App. at 57. From 1984 to the present, Rolls-Royce consistently contributed to the Funds only for regular workers. In December of 1989, the Funds filed suit against Rolls-Royce, pursuant to section 515 of the Employee Retirement Income Security Act (“ERISA”), 29 U.S.C. § 1145 (1988)
Rolls-Royce asserted that the scope of coverage of Article XX(a) is ambiguous because the agreement utilizes the broad term “employee” in provisions that necessarily apply only to regular employees. To support its contention that it is unclear whether the language of Article XX(a) includes probationary employees, Rolls-Royce submitted the affidavit of its secretary and general counsel, William Kennedy. Kennedy’s uncontradicted affidavit states that Rolls-Royce never contributed to the Funds for probationary employees. Although it was aware of Rolls-Royce’s failure to contribute for probationary employees, Local 560 never raised this issue at collective bargaining negotiations or at any other time before the filing of this suit, and never filed a grievance requesting that Rolls-Royce make such contributions. While receiving payments from Rolls-Royce for over five years, the Funds also never demanded contributions on behalf of probationary employees.
The parties filed cross-motions for summary judgment. The bargaining history, as set forth in the Kennedy affidavit, was undisputed. Ignoring the prior practice of the parties, the district court found that the contractual term “each employee” unambiguously encompassed both regular and probationary employees. The district court therefore granted summary judgment in favor of the Funds and ordered Rolls-Royce to produce various books and records for an audit by the Funds. Rolls-Royce appeals this order.
We have jurisdiction' pursuant to 28 U.S.C. § 1291 (1988) and exercise plenary review over the district court’s order granting summary judgment. Philadelphia and Reading Corp. v. United States,
Although federal law governs the construction of collective bargaining agreements, see Textile Workers Union v. Lincoln Mills,
The collective bargaining agreement requires Rolls-Royce to make contributions for “each employee.”'
All new employees engaged by the Employer shall be deemed for the first sixty (60) days of their employment to be engaged for a trial period. All such new employees (hereinafter sometimes referred to as “probationary employees”) may be disciplined, laid off or discharged with or without cause in the sole discretion of the Employer during such trial period.... After the said trial period, all such employees shall be deemed to be regular employees covered by this Agreement....
App. at 31-32.
Several clauses in the agreement specifically mandate different treatment of probationary employees and regular employees. Article II(2)(c) requires the employer to deduct union dues from the wages of regular employees, Article X provides that regular employees will be paid every other week on Fridays for the pay period ending on that Friday, and Article XXV guarantees that a regular employee will be paid while serving jury duty. Additionally, Article VII prohibits discharges without cause, but has an exception for probationary employees. The Funds argue that because the agreement distinguishes between probationary and regular employees in certain provisions, the unqualified term “employee” must include both categories of workers.
To counter the construction advocated by the Funds, Rolls-Royce points to other provisions in the collective bargaining agreement that apply by their terms to all employees, but must refer only to regular workers. For example, Article IV(4)(b) states that “[a]ny employee who is absent because of proven illness or disability of not more than six (6) months duration shall maintain his seniority.” App. at 35-36. The term “any employee” necessarily excludes probationary employees because probationary employees do not achieve seniority until the sixty-first day of their employment when they become regular employees.
Further, Article II(2)(b) states that “[a]f-ter the said trial period, [probationary] employees shall be deemed to be regular employees covered by this Agreement.” App. at 31-32 (emphasis added). The natural inference to be drawn from this provision is that employees are not even covered by the collective bargaining agreement, let alone entitled to welfare and pension fund contributions on their behalf, until after the trial period. The fact that union membership is obligatory only for regular employees reinforces this inference. Rolls-Royce buttresses its interpretation with evidence that for over five years, it never made a single contribution for a probationary employee. Moreover, before filing this suit, neither Local 560 nor the Funds ever requested that Rolls-Royce make such payments.
Because some provisions in the collective bargaining agreement specifically use the terms “probationary” or “regular” employees, while other clauses utilize the broad term “employee” yet necessarily apply only to regular employees, we find the term “each employee” in Article XX(a) to be ambiguous.
Ordinarily, we would remand the issue of intent to the district court for a factual finding to be made. See Alexander v. Primerica Holdings, Inc.,
The past dealings of contracting parties pursuant to an agreement are probative of the parties’ intent. See Restatement (Second) of Contracts § 223(2) (1981); Cities of Campbell v. Federal Energy Regulatory Comm’n,
The Funds’ conduct also reflects their understanding that the collective bargaining agreement did not require payments for probationary employees. ERISA imposes a number of fiduciary duties on the Funds. See Agathos v. Starlite Motel, 977 F.2d 1500, 1507 (3d Cir.1992). They must “take steps to identify all participants and beneficiaries, so that the trustees can make them aware of their status and rights,” Central States, Southeast and Southwest Areas Pension Fund v. Central Transport, Inc.,
To prevent union corruption and protect employee expectations, multiemployer funds are immune from many contract defenses that would bar unions from enforcing a collective bargaining agreement. See, e.g., Benson v. Brower’s Moving & Storage, Inc.,
III. CONCLUSION
For the foregoing reasons, we will reverse the grant of summary judgment in favor of the Funds and remand the matter to the district court with instructions to grant summary judgment in favor of Rolls-Royce.
Notes
. Section 515 of ERISA provides:
Every employer who is obligated to make contributions to a multiemployer plan under the terms of the plan or under the terms of a collectively bargained agreement shall, to the extent not inconsistent with law, make such contributions in accordance with the terms and conditions of such plan or such agreement.
. The Funds urge us to review the district court’s construction of the collective bargaining agreement for clear error. The Funds base this argument on the false assumption that the district court made a factual determination when it decided that the collective bargaining agreement was unambiguous. The interpretation of an ambiguous contractual provision is a factual question. See Mack Trucks,
. Article XX(a) of the collective bargaining agreement provides:
Contributions for welfare and pension shall be paid by the Employer for each employee for a, maximum of ... forty (40) hours per week per employee.
App. at 57.
. The Funds reliance on the unpublished decision of Teamsters Industrial Employees Welfare Fund v. Halper Brothers, No. 89-1963 (D.N.J. Feb. 5, 1991), is misplaced. In Halper Brothers, the district court found that a provision requiring the employer contribute to specified funds for "each employee” unambiguously applied to both union and non-union employees. The collective bargaining agreement at issue, however, contained no distinctions between union and non-union employees. This case is very different because the collective bargaining agreement defines a subclass of workers, probationary employees, and often treats them very differently from regular workers. Indeed, Article II(2)(b) implies that probationary employees are not even covered by the agreement.
