# B737 Maintenance Mastermind — Tool for Boeing 737 NG & MAX > Tool for Boeing 737 NG & MAX (iPhone/iPad app by Nemanja Dimitrijevic.) - Source: https://appshunter.io/ios/app/b737-maintenance-mastermind/id6819862964 (this page in markdown: same URL + `.md`) - Developer: [Nemanja Dimitrijevic](https://appshunter.io/developer/1732443666) - Category: Utilities, Education - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 18.0 · 10 MB - Languages: American English - Released: 2026-10-19 - Data updated: 2026-10-27 ## What is B737 Maintenance Mastermind? B737 Maintenance Mastermind is an independent quick-reference and utility app designed to support aircraft technicians, engineers, mechanics, and aviation professionals working with Boeing 737 NG and MAX aircraft. The B737MM app combines fast offline tools with secure premium reference modules, helping users quickly find maintenance-related information, calculations, references, and troubleshooting guidance during study, training, planning, or daily technical routines. FREE TOOLS • MEL Calculator Quick helper for standard dispatch time limit calculations. • Unit Converter Fast conversion of common aviation units, including pressure, temperature, volume, weight, and fuel-related values. • Fuel Calculator Useful fuel uplift and density calculation tool for quick planning and cross-checking. • Abbreviations Dictionary Large searchable glossary of aviation, maintenance, and technical abbreviations. PREMIUM REFERENCE MODULES • Alerts Searchable cockpit alert, status, and message references with related technical context. • Flags Reference guide for PFD, ND, FMC/CDU, and display flags. • BITE Built-In Test Equipment reference module with test access information and related troubleshooting links. • MEL Reference Fast searchable Minimum Equipment List reference support for NG/MAX style workflows. • CDL Reference Configuration Deviation List reference module for missing or deferred aircraft configuration items. • Circuit Breakers / CB ATA-grouped circuit breaker reference with panel-related information. • Lights Cockpit, annunciator, and system light reference module with related system context. • Location Aircraft component, access panel, service panel, antenna, and equipment location references. • STA Map Station, frame, stringer, waterline, and aircraft location reference helper for quick orientation. • Visual Panels Interactive visual reference for cockpit panels and related light/panel locations. • Support & Materials Technical support notes, fastener/material references, practical troubleshooting notes, and maintenance helper information. PREMIUM ACCESS Premium reference modules open with an auto-renewable yearly subscription (with a 3-day free trial for eligible users) or a one-time lifetime purchase, both offered in the app. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in your Apple Account settings at any time after purchase. Use Restore Purchases in the app to restore access on a new device. Some premium content requires internet access for first download, access verification, or content updates. Once downloaded, content is available on the device for fast access. IMPORTANT DISCLAIMER This application is an independent reference and training support tool. It is not official Boeing documentation and is not affiliated with, endorsed by, sponsored by, or associated with The Boeing Company, any airline, aircraft operator, maintenance organization, or aviation authority. The information in this app is provided for educational, training, and general reference purposes only. The official Aircraft Maintenance Manual (AMM), Fault Isolation Manual (FIM), Illustrated Parts Catalog (IPC), Wiring Diagram Manual (WDM), Structural Repair Manual (SRM), and the operator-approved MEL/CDL are the only official sources and must always take precedence. Do not use this application as the sole source for aircraft maintenance actions, dispatch release decisions, operational decisions, or work on an actual aircraft. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://b737mm.com/privacy/ ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Yearly | $8.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Premium Lifetime | $17.00 | one-time | ## Is B737 Maintenance Mastermind safe? Not enough ratings yet to assess B737 Maintenance Mastermind. ## Is B737 Maintenance Mastermind legit? B737 Maintenance Mastermind appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for B737 Maintenance Mastermind is 70 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 3 releases) ### 1.2 — 2026-10-23 Location records now show their place on the aircraft drawing, with a link that opens the same spot on the STA Map. STA Map objects and taps match the reference data. Small fixes. ### 1.1 — 2026-10-22 Version 1.1 • Home: search is now directly under the 737 NG / 737 MAX switch, and free modules are marked "Open". • The selected aircraft model applies everywhere, including Related BITE tests, Favorites and Recently viewed. • STA Map redrawn: cleaner aircraft outlines with cabin windows, objects coloured by type, and a green marker on the selected point. • Location: a new E/E section with rack drawings, and an STA map reference on linked location records. • CB: each circuit breaker record shows the panel layout with its panel marked. ### 1.0 — 2026-10-20 No release notes. ## More apps by Nemanja Dimitrijevic - [A330 System Reset Pro](https://appshunter.io/ios/app/a330-system-reset-pro/id6478288447) - [A320 ECAM Reset Pro](https://appshunter.io/ios/app/a320-ecam-reset-pro/id6478288631) All apps by Nemanja Dimitrijevic: https://appshunter.io/developer/1732443666 ## Related topics [737 master caution](https://appshunter.io/ios/topics/737-master-caution) · [b737 qrg](https://appshunter.io/ios/topics/b737-qrg) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-27.*